CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY - USD ($) $ in Thousands	Total	Common Stock Class A-1 Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2019		76,637,470
Beginning balance at Dec. 31, 2019	$ (43,010)	$ 8	$ 8,352		$ (51,370)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of A-2 common stock to A-1 common stock (in shares)		1,596,636
Conversion of Class A-2 Common Stock to Class A-1 Common Stock	19,160		19,160
Employee stock option compensation	1,060		1,060
Unrealized gain on investment in convertible notes, net	0
Net income	48,043				48,043
Ending balance (in shares) at Mar. 31, 2020		78,234,106
Ending balance at Mar. 31, 2020	25,253	$ 8	28,572		(3,327)
Beginning balance (in shares) at Dec. 31, 2020		93,379,508
Beginning balance at Dec. 31, 2020	127,871	$ 9	179,549	$ 93	(51,780)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee stock option compensation	1,593		1,593
Unrealized gain on investment in convertible notes, net	469			469
Net income	1,501				1,501
Ending balance (in shares) at Mar. 31, 2021		93,379,508
Ending balance at Mar. 31, 2021	$ 131,434	$ 9	$ 181,142	$ 562	$ (50,279)