{"cik": 1759138, "entity": "CABALETTA BIO, INC.", "tags": {"OperatingIncomeLoss": [{"end": "2018-12-31", "val": -6193000, "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-30", "start": "2018-01-01"}, {"end": "2019-12-31", "val": -18683000, "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-30", "start": "2019-01-01"}, {"end": "2019-12-31", "val": -18683000, "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-16", "start": "2019-01-01"}, {"end": "2020-12-31", "val": -33833000, "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-16", "start": "2020-01-01"}, {"end": "2020-12-31", "val": -33833000, "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-17", "start": "2020-01-01"}, {"end": "2021-12-31", "val": -46313000, "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-17", "start": "2021-01-01"}, {"end": "2021-12-31", "val": -46313000, "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-16", "start": "2021-01-01"}, {"end": "2022-12-31", "val": -54139000, "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-16", "start": "2022-01-01"}, {"end": "2022-12-31", "val": -54139000, "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-21", "start": "2022-01-01"}, {"end": "2023-12-31", "val": -74660000, "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-21", "start": "2023-01-01"}, {"end": "2023-12-31", "val": -74660000, "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-31", "start": "2023-01-01"}, {"end": "2024-12-31", "val": -125141000, "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-31", "start": "2024-01-01"}, {"end": "2024-12-31", "val": -125141000, "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-23", "start": "2024-01-01"}, {"end": "2025-12-31", "val": -172241000, "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-23", "start": "2025-01-01"}], "NetIncomeLoss": [{"end": "2018-12-31", "val": -12202000, "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-30", "start": "2018-01-01"}, {"end": "2019-12-31", "val": -16943000, "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-30", "start": "2019-01-01"}, {"end": "2019-12-31", "val": -16943000, "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-16", "start": "2019-01-01"}, {"end": "2020-12-31", "val": -33339000, "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-16", "start": "2020-01-01"}, {"end": "2020-12-31", "val": -33339000, "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-17", "start": "2020-01-01"}, {"end": "2021-12-31", "val": -46289000, "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-17", "start": "2021-01-01"}, {"end": "2021-12-31", "val": -46289000, "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-16", "start": "2021-01-01"}, {"end": "2022-12-31", "val": -52975000, "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-16", "start": "2022-01-01"}, {"end": "2022-12-31", "val": -52975000, "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-21", "start": "2022-01-01"}, {"end": "2023-12-31", "val": -67675000, "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-21", "start": "2023-01-01"}, {"end": "2023-12-31", "val": -67675000, "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-31", "start": "2023-01-01"}, {"end": "2024-12-31", "val": -115864000, "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-31", "start": "2024-01-01"}, {"end": "2024-12-31", "val": -115864000, "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-23", "start": "2024-01-01"}, {"end": "2025-12-31", "val": -167856000, "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-23", "start": "2025-01-01"}], "IncomeTaxExpenseBenefit": [{"end": "2024-12-31", "val": 0, "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-23", "start": "2024-01-01"}, {"end": "2025-12-31", "val": 0, "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-23", "start": "2025-01-01"}], "InterestExpense": [{"end": "2023-12-31", "val": 0, "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-31", "start": "2023-01-01"}, {"end": "2024-12-31", "val": 748000, "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-31", "start": "2024-01-01"}, {"end": "2024-12-31", "val": 748000, "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-23", "start": "2024-01-01"}, {"end": "2025-12-31", "val": 2004000, "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-23", "start": "2025-01-01"}], "Depreciation": [{"end": "2018-12-31", "val": 0, "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-30", "start": "2018-01-01"}, {"end": "2019-12-31", "val": 104000, "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-30", "start": "2019-01-01"}, {"end": "2019-12-31", "val": 104000, "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-16", "start": "2019-01-01"}, {"end": "2020-12-31", "val": 354000, "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-16", "start": "2020-01-01"}, {"end": "2020-12-31", "val": 354000, "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-17", "start": "2020-01-01"}, {"end": "2021-12-31", "val": 733000, "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-17", "start": "2021-01-01"}, {"end": "2021-12-31", "val": 733000, "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-16", "start": "2021-01-01"}, {"end": "2022-12-31", "val": 1178000, "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-16", "start": "2022-01-01"}, {"end": "2022-12-31", "val": 1178000, "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-21", "start": "2022-01-01"}, {"end": "2023-12-31", "val": 1426000, "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-21", "start": "2023-01-01"}, {"end": "2023-12-31", "val": 1426000, "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-31", "start": "2023-01-01"}, {"end": "2024-12-31", "val": 1711000, "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-31", "start": "2024-01-01"}, {"end": "2024-12-31", "val": 1711000, "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-23", "start": "2024-01-01"}, {"end": "2025-12-31", "val": 1646000, "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-23", "start": "2025-01-01"}], "NetCashProvidedByUsedInOperatingActivities": [{"end": "2018-12-31", "val": -4661000, "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-30", "start": "2018-01-01"}, {"end": "2019-12-31", "val": -16045000, "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-30", "start": "2019-01-01"}, {"end": "2019-12-31", "val": -16045000, "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-16", "start": "2019-01-01"}, {"end": "2020-12-31", "val": -26770000, "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-16", "start": "2020-01-01"}, {"end": "2020-12-31", "val": -26770000, "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-17", "start": "2020-01-01"}, {"end": "2021-12-31", "val": -34109000, "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-17", "start": "2021-01-01"}, {"end": "2021-12-31", "val": -34109000, "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-16", "start": "2021-01-01"}, {"end": "2022-12-31", "val": -46380000, "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-16", "start": "2022-01-01"}, {"end": "2022-12-31", "val": -46380000, "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-21", "start": "2022-01-01"}, {"end": "2023-12-31", "val": -53549000, "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-21", "start": "2023-01-01"}, {"end": "2023-12-31", "val": -53549000, "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-31", "start": "2023-01-01"}, {"end": "2024-12-31", "val": -88222000, "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-31", "start": "2024-01-01"}, {"end": "2024-12-31", "val": -88222000, "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-23", "start": "2024-01-01"}, {"end": "2025-12-31", "val": -131080000, "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-23", "start": "2025-01-01"}], "PaymentsToAcquirePropertyPlantAndEquipment": [{"end": "2019-12-31", "val": 693000, "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-30", "start": "2019-01-01"}, {"end": "2019-12-31", "val": 693000, "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-16", "start": "2019-01-01"}, {"end": "2020-12-31", "val": 635000, "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-16", "start": "2020-01-01"}, {"end": "2020-12-31", "val": 635000, "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-17", "start": "2020-01-01"}, {"end": "2021-12-31", "val": 1166000, "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-17", "start": "2021-01-01"}, {"end": "2021-12-31", "val": 1166000, "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-16", "start": "2021-01-01"}, {"end": "2022-12-31", "val": 2453000, "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-16", "start": "2022-01-01"}, {"end": "2022-12-31", "val": 2453000, "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-21", "start": "2022-01-01"}, {"end": "2023-12-31", "val": 687000, "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-21", "start": "2023-01-01"}, {"end": "2023-12-31", "val": 687000, "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-31", "start": "2023-01-01"}, {"end": "2024-12-31", "val": 2211000, "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-31", "start": "2024-01-01"}, {"end": "2024-12-31", "val": 2211000, "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-23", "start": "2024-01-01"}, {"end": "2025-12-31", "val": 1229000, "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-23", "start": "2025-01-01"}], "StockholdersEquity": [{"end": "2017-12-31", "val": -249000, "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-30"}, {"end": "2018-12-31", "val": -10690000, "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-30"}, {"end": "2018-12-31", "val": -10690000, "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-16"}, {"end": "2019-12-31", "val": 138321000, "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-30"}, {"end": "2019-12-31", "val": 138321000, "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-16"}, {"end": "2019-12-31", "val": 138321000, "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-17"}, {"end": "2020-12-31", "val": 109544000, "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-16"}, {"end": "2020-12-31", "val": 109544000, "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-17"}, {"end": "2020-12-31", "val": 109544000, "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-16"}, {"end": "2021-12-31", "val": 117956000, "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-17"}, {"end": "2021-12-31", "val": 117956000, "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-16"}, {"end": "2021-12-31", "val": 117956000, "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-21"}, {"end": "2022-12-31", "val": 104520000, "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-16"}, {"end": "2022-12-31", "val": 104520000, "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-21"}, {"end": "2022-12-31", "val": 104520000, "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-31"}, {"end": "2023-12-31", "val": 236198000, "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-21"}, {"end": "2023-12-31", "val": 236198000, "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-31"}, {"end": "2023-12-31", "val": 236198000, "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-23"}, {"end": "2024-12-31", "val": 152335000, "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-31"}, {"end": "2024-12-31", "val": 152335000, "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-23"}, {"end": "2025-12-31", "val": 112051000, "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-23"}], "CashAndCashEquivalentsAtCarryingValue": [{"end": "2018-12-31", "val": 33017000, "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-30"}, {"end": "2019-12-31", "val": 136204000, "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-30"}, {"end": "2019-12-31", "val": 136204000, "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-16"}, {"end": "2020-12-31", "val": 101429000, "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-16"}, {"end": "2020-12-31", "val": 101429000, "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-17"}, {"end": "2021-12-31", "val": 122222000, "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-17"}, {"end": "2021-12-31", "val": 122222000, "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-16"}, {"end": "2022-12-31", "val": 81607000, "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-16"}, {"end": "2022-12-31", "val": 81607000, "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-21"}, {"end": "2023-12-31", "val": 193238000, "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-21"}, {"end": "2023-12-31", "val": 193238000, "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-31"}, {"end": "2024-12-31", "val": 163962000, "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-31"}, {"end": "2024-12-31", "val": 163962000, "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-23"}, {"end": "2025-12-31", "val": 82982000, "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-23"}], "ShortTermInvestments": [{"end": "2020-12-31", "val": 7233000, "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-16"}, {"end": "2020-12-31", "val": 7233000, "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-17"}, {"end": "2021-12-31", "val": 0, "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-16"}, {"end": "2022-12-31", "val": 24940000, "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-16"}, {"end": "2022-12-31", "val": 24940000, "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-21"}, {"end": "2023-12-31", "val": 48011000, "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-21"}, {"end": "2023-12-31", "val": 48011000, "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-31"}, {"end": "2024-12-31", "val": 0, "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-31"}, {"end": "2024-12-31", "val": 0, "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-23"}, {"end": "2025-12-31", "val": 50617000, "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-23"}], "WeightedAverageNumberOfSharesOutstandingBasic": [{"end": "2022-12-31", "val": 5942036, "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-16", "start": "2022-01-01"}, {"end": "2022-12-31", "val": 5942036, "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-21", "start": "2022-01-01"}, {"end": "2023-12-31", "val": 1168054, "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-21", "start": "2023-01-01"}, {"end": "2023-12-31", "val": 1168054, "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-31", "start": "2023-01-01"}], "CommonStockSharesOutstanding": [{"end": "2018-12-31", "val": 3848320, "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-30"}, {"end": "2019-12-31", "val": 24034022, "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-30"}, {"end": "2019-12-31", "val": 24034022, "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-16"}, {"end": "2020-12-31", "val": 24062775, "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-16"}, {"end": "2020-12-31", "val": 24062775, "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-17"}, {"end": "2021-12-31", "val": 28927129, "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-17"}, {"end": "2021-12-31", "val": 28927129, "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-16"}, {"end": "2022-12-31", "val": 29445134, "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-16"}, {"end": "2022-12-31", "val": 29445134, "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-21"}, {"end": "2023-12-31", "val": 47823232, "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-21"}, {"end": "2023-12-31", "val": 47823232, "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-31"}, {"end": "2024-12-31", "val": 50743101, "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-23"}, {"end": "2025-12-31", "val": 100479323, "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-23"}], "EntityCommonStockSharesOutstanding": [{"end": "2020-03-20", "val": 24034022, "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-30"}, {"end": "2021-03-10", "val": 24062775, "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-16"}, {"end": "2022-03-10", "val": 28977129, "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-17"}, {"end": "2023-03-10", "val": 31340989, "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-16"}, {"end": "2024-03-15", "val": 48241615, "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-21"}, {"end": "2025-03-27", "val": 50743101, "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-31"}, {"end": "2026-03-19", "val": 111322671, "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-23"}]}}