Segments - Reconciles Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted EBITDA	$ 28,306	$ 20,831	$ 42,764	$ 31,703
Depreciation	(2,983)	(1,529)	(5,856)	(3,183)
Amortization	(2,250)	(1,278)	(4,492)	(2,557)
Interest	(5,967)	(2,242)	(10,671)	(4,179)
Acquisition costs	(146)	(2,889)	(732)	(3,465)
Stock based compensation expense	(1,844)	(1,602)	(4,402)	(3,146)
Non same-store revenue	953	2,155	3,235	3,671
Non same-store costs	(3,698)	(4,045)	(10,098)	(7,296)
Fair value adjustment of contingent note		(1,460)		(780)
Integration costs and costs of discontinued clinics	(8,850)	(1,142)	(9,304)	(1,142)
Clinic launch expenses	(603)		(1,279)
Litigation expenses	(384)		(433)
COVID-19 related costs	(4,433)		(4,433)
Pretax net (loss) income	(1,899)	6,799	(5,701)	9,625
Income tax benefit (expense)	(61)	(881)	1,108	(1,381)
Net (loss) income	(1,960)	5,918	(4,593)	8,244
Products | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted EBITDA	41,851	21,156	66,130	34,712
Services | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted EBITDA	1,112	6,804	3,101	12,081
Unallocated Corporate | Corporate, Non-Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted EBITDA	$ (14,657)	$ (7,130)	$ (26,467)	$ (15,091)