Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Treasury Stock	Additional Paid in Capital	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment	Accumulated Deficit	Other Comprehensive Income	Cumulative Effect, Period of Adoption, Adjustment	Total
Balance at beginning of period at Dec. 31, 2019	$ 8	$ (1,009)	$ 228,755	$ (1,169)	$ (113,483)		$ (1,169)	$ 114,271
Balance at beginning of period (in shares) at Dec. 31, 2019	84,188,202
Increase (Decrease) in Stockholders' Equity
Issuance of employee equity awards, net of shares withheld	$ 1		(3,296)					(3,295)
Issuance of employee equity awards, net of shares withheld (in shares)	2,354,717
Stock-based compensation			8,661					8,661
Initial public offering costs			14					14
Other comprehensive income						$ 17		17
Net income					7,387			7,387
Balance at end of period at Sep. 30, 2020	$ 9	(1,009)	234,134		(107,265)	17		125,886
Balance at end of period (in shares) at Sep. 30, 2020	86,542,919
Balance at beginning of period at Jun. 30, 2020	$ 9	(1,009)	231,792		(112,087)	5		118,710
Balance at beginning of period (in shares) at Jun. 30, 2020	85,778,057
Increase (Decrease) in Stockholders' Equity
Issuance of employee equity awards, net of shares withheld			(628)					(628)
Issuance of employee equity awards, net of shares withheld (in shares)	764,862
Stock-based compensation			3,071					3,071
Initial public offering costs			(101)					(101)
Other comprehensive income						12		12
Net income					4,822			4,822
Balance at end of period at Sep. 30, 2020	$ 9	(1,009)	234,134		(107,265)	17		125,886
Balance at end of period (in shares) at Sep. 30, 2020	86,542,919
Balance at beginning of period at Dec. 31, 2020	$ 9	(1,009)	236,139		(68,193)	1		$ 166,947
Balance at beginning of period (in shares) at Dec. 31, 2020	87,054,329							87,054,329
Increase (Decrease) in Stockholders' Equity
Issuance of employee equity awards, net of shares withheld			(11,952)					$ (11,952)
Issuance of employee equity awards, net of shares withheld (in shares)	2,129,490
Stock-based compensation			18,742					18,742
Warrant exercise			0					0
Warrant exercise (in shares)	824,991
Other comprehensive income						(313)		(313)
Net income					50,689			50,689
Balance at end of period at Sep. 30, 2021	$ 9	(1,009)	242,929		(17,504)	(312)		$ 224,113
Balance at end of period (in shares) at Sep. 30, 2021	90,008,810							90,008,810
Balance at beginning of period at Jun. 30, 2021	$ 9	(1,009)	240,111		(34,300)	(270)		$ 204,541
Balance at beginning of period (in shares) at Jun. 30, 2021	89,360,084
Increase (Decrease) in Stockholders' Equity
Issuance of employee equity awards, net of shares withheld			(4,361)					(4,361)
Issuance of employee equity awards, net of shares withheld (in shares)	648,726
Stock-based compensation			7,179					7,179
Other comprehensive income						(42)		(42)
Net income					16,796			16,796
Balance at end of period at Sep. 30, 2021	$ 9	$ (1,009)	$ 242,929		$ (17,504)	$ (312)		$ 224,113
Balance at end of period (in shares) at Sep. 30, 2021	90,008,810							90,008,810