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Summary of Significant Accounting Policies - Disaggregated Revenue by Payor Type and Major Service (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 78,809	$ 71,944	$ 50,878	$ 63,535	$ 59,104	$ 54,673	$ 52,441	$ 48,334	$ 265,166	$ 214,552	$ 147,277
Contracted third-party payors
Disaggregation of Revenue [Line Items]
Revenue									135,939	101,845	56,949
Non-contracted third-party payors
Disaggregation of Revenue [Line Items]
Revenue									15,295	10,770	12,447
Centers for Medicare & Medicaid
Disaggregation of Revenue [Line Items]
Revenue									72,536	58,918	40,482
Healthcare institutions
Disaggregation of Revenue [Line Items]
Revenue									$ 41,396	$ 43,019	$ 37,399

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