Consolidated statement of stockholders' equity - USD ($) shares in Thousands, $ in Thousands	Total	Members' deficit	Common stock Class A Common Stock	Common stock Class B Common Stock	Additional paid in capital	Accumulated deficit	Parent	Noncontrolling Interest
Beginning balance at Dec. 31, 2017	$ (41,133)	$ (41,133)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	3,768	3,768
Dividends	0	0
Ending balance (in shares) at Mar. 31, 2018			0	0
Ending balance at Mar. 31, 2018	(37,365)	(37,365)	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Beginning balance at Dec. 31, 2017	(41,133)	(41,133)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(18,667)
Ending balance (in shares) at Dec. 31, 2018			13,799	22,486
Ending balance at Dec. 31, 2018	(25,203)	0	$ 138	$ 224	11,899	(20,761)	(8,500)	(16,703)
Beginning balance (in shares) at Mar. 31, 2018			0	0
Beginning balance at Mar. 31, 2018	(37,365)	(37,365)	$ 0	$ 0	0	0	0	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	621	621
Dividends	(1,278)	(1,278)
Ending balance at May. 01, 2018	(38,022)	(38,022)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	2,960					801	801	2,159
Effects of the Reorganization Transactions (in shares)				22,747
Effects of the Reorganization Transactions	(113,734)	38,022		$ 227	(94,180)	(21,562)	(115,515)	(36,241)
Initial non-controlling interest allocation	0				(18,920)		(18,920)	18,920
Issuance of Class A common stock sold in initial public offering, net of offering costs (in shares)			13,533
Issuance of Class A common stock sold in initial public offering, net of offering costs	124,010		$ 135		123,875		124,010
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(1,735)							(1,735)
Equity-based compensation	949				949		949
Activity under employee stock purchase plan (in shares)			5
Activity under employee stock purchase plan	143				143		143
Redemption of LLC Units (in shares)			261	(261)
Redemption of LLC Units	0		$ 3	$ (3)	(194)		(194)	194
Deferred tax adjustments related to Tax Receivable Agreement	315				315		315
Deferred tax adjustments	(89)				(89)		(89)
Ending balance (in shares) at Dec. 31, 2018			13,799	22,486
Ending balance at Dec. 31, 2018	(25,203)	$ 0	$ 138	$ 224	11,899	(20,761)	(8,500)	(16,703)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	10,382					3,567	3,567	6,815
Distributions	(3,739)							(3,739)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(15,000)					(5,962)	(5,962)	(9,038)
Equity-based compensation	1,526				1,526		1,526
Activity under employee stock purchase plan (in shares)			8
Activity under employee stock purchase plan	325				325		325
Redemption of LLC Units (in shares)			1,431	(1,431)
Redemption of LLC Units	0		$ 14	$ (14)	(1,368)		(1,368)	1,368
Deferred tax adjustments related to Tax Receivable Agreement	2,060				2,060		2,060
Reallocation of Non-controlling interest	0					(138)	(138)	138
Ending balance (in shares) at Dec. 31, 2019			15,238	21,055
Ending balance at Dec. 31, 2019	$ (31,007)		$ 152	$ 210	$ 14,442	$ (23,811)	$ (9,007)	$ (22,000)