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]	Accumulated Deficit	Noncontrolling Interest [Member]	Total
Stockholders' Equity, Beginning 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			856			856
Vesting of restricted units		1	(39)			(38)
Net income (loss)				4,721	298	5,019
Stockholders' Equity, Ending Balance at Mar. 31, 2019	329	156	252,559	(12,614)	3,794	244,224
Stockholders' Equity, Beginning Balance at Dec. 31, 2018	329	155	251,742	(17,335)	3,496	238,387
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)						8,005
Stockholders' Equity, Ending Balance at Jun. 30, 2019	332	157	248,386	(9,942)	636	239,569
Stockholders' Equity, Beginning Balance at Mar. 31, 2019	329	156	252,559	(12,614)	3,794	244,224
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share based compensation			1,024			1,024
Vesting of restricted units	3	1	(10)			(6)
Purchase of noncontrolling interest			(5,187)		(3,472)	(8,659)
Net income (loss)				2,672	314	2,986
Stockholders' Equity, Ending Balance at Jun. 30, 2019	332	157	248,386	(9,942)	636	239,569
Stockholders' Equity, Beginning Balance at Dec. 31, 2019	333	157	250,700	(20,982)	628	230,836
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share based compensation			836			836
Issuance of common stock under ESPP, value	1		419			420
Vesting of restricted units	1	1	(93)			(91)
Net income (loss)				(9,216)	(16)	(9,232)
Stockholders' Equity, Ending Balance at Mar. 31, 2020	335	158	251,862	(30,198)	612	222,769
Stockholders' Equity, Beginning Balance at Dec. 31, 2019	333	157	250,700	(20,982)	628	230,836
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)						(204)
Stockholders' Equity, Ending Balance at Jun. 30, 2020	336	158	258,557	(20,700)	1,886	240,237
Stockholders' Equity, Beginning Balance at Mar. 31, 2020	335	158	251,862	(30,198)	612	222,769
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share based compensation			1,164			1,164
Issuance of subsidiary shares in business combination			5,534		1,744	7,278
Vesting of restricted units	1		(3)			(2)
Net income (loss)				9,498	(470)	9,028
Stockholders' Equity, Ending Balance at Jun. 30, 2020	$ 336	$ 158	$ 258,557	$ (20,700)	$ 1,886	$ 240,237