Condensed Consolidated Statement of Changes in Redeemable Noncontrolling Interest and Stockholders' Deficit - (Unaudited) - USD ($) $ in Thousands	Total	Redeemable Noncontrolling Interest [Member]	Class A Common Stock [Member]	Class B Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]
Beginning balance at Dec. 31, 2019	$ (49,023)		$ 409	$ 232	$ 183,858	$ (233,522)
Beginning balance, redeemable noncontrolling interest at Dec. 31, 2019		$ 40,183
Beginning balance, shares at Dec. 31, 2019			40,918,522	23,094,221
Net loss	(4,724)	(2,441)				(4,724)
Share-based compensation	380				380
Issuance of Class A Common Stock to a related party under the Letter Agreements	6,000		$ 38		5,962
Issuance of Class A Common Stock to a related party under the Letter Agreements, shares			3,750,000
Vesting of restricted stock units, shares			11,667
Change in redemption value of noncontrolling interest	(14,454)	14,454				(14,454)
Ending balance at Mar. 31, 2020	(61,821)		$ 447	$ 232	190,200	(252,700)
Ending balance, redeemable noncontrolling interest at Mar. 31, 2020		52,196
Ending balance, shares at Mar. 31, 2020			44,680,189	23,094,221
Beginning balance at Dec. 31, 2020	(80,102)		$ 541	$ 232	209,161	(290,036)
Beginning balance, redeemable noncontrolling interest at Dec. 31, 2020		83,895
Beginning balance, shares at Dec. 31, 2020			54,050,710	23,094,221
Net loss	(4,241)	(1,701)				(4,241)
Share-based compensation	436				436
Exchange of class B common stock, shares			361	(361)
Exercise of stock options	$ 47				47
Exercise of stock options, shares	20,833		20,833
Issuance of Class A Common Stock under LPC Agreement	$ 8,038		$ 35		8,003
Issuance of class A common stock under LPC agreement, shares			3,500,000
Change in redemption value of noncontrolling interest	19,547	(19,547)				19,547
Ending balance at Mar. 31, 2021	(56,275)		$ 576	$ 232	$ 217,647	$ (274,730)
Ending balance, redeemable noncontrolling interest at Mar. 31, 2021	$ 62,647	$ 62,647
Ending balance, shares at Mar. 31, 2021			57,571,904	23,093,860