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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue (Narrative) (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
May 29, 2020 | May 07, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Stock split, conversion ratio | 300.00% | 300.00% |  |
Deferred revenue |  |  | $ 6.3 | $ 8.4
Revenue recognized that was previously deferred |  |  | $ 6.3 | $ 5.5
Hemodynamic Monitors |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Contract length |  |  | The Company sells separately priced service contracts, which range from 12 to 36 months, to owners of its hemodynamic monitors. |

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