Consolidated Statement of Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Common Stock [Member] Class A common stock	Common Stock [Member] Common Class B [Member]	Additional Paid-in Capital [Member] Class A common stock	Additional Paid-in Capital [Member] Common Class B [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit Class A common stock	Accumulated Deficit Common Class B [Member]	Accumulated Deficit	Noncontrolling Interest [Member]	Total
Temporary Equity, Beginning Balance at Dec. 31, 2016										$ 3,131
Increase (Decrease) in Temporary Equity [Roll Forward]
Amortization of restricted stock										673
Dividend of repurchased member units										(523)
Temporary Equity, Ending Balance at Dec. 31, 2017										3,281
Stockholders' Equity, Beginning Balance at Dec. 31, 2016	$ 64				$ 1			$ (39,399)	$ 2,166	(37,168)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income								(4,060)	123	(3,937)
Stockholders' Equity, Ending Balance at Dec. 31, 2017	64				1			(43,459)	2,289	(41,105)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASC 606								1,459		1,459
Share-based compensation										391
Transfer from temporary equity to permanent equity										(3,455)
Dividend of repurchased member units										(217)
Share based compensation					1,856					1,856
Shares cancelled, value	(64)							64
Issuance of shares in reorganization, value	160	$ 155	$ (11)	$ (6)		$ (149)	$ (149)
Transfer from temporary equity to permanent equity					3,455					3,455
Issuance of common stock under ESPP	167				246,449					246,616
Vesting of restricted units	2				(2)
Net income								24,899	1,207	26,106
Stockholders' Equity, Ending Balance at Dec. 31, 2018	329	155			251,742			(17,335)	3,496	238,387
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share based compensation					3,846					3,846
Issuance of common stock under ESPP	1				348					349
Vesting of restricted units	3	2			(49)					(44)
Purchase of noncontrolling interest					(5,187)				(3,472)	(8,659)
Net income								(3,647)	604	(3,043)
Stockholders' Equity, Ending Balance at Dec. 31, 2019	$ 333	$ 157			$ 250,700			$ (20,982)	$ 628	$ 230,836