Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total		Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income	Accumulated Deficit
Beginning balance, shares (in shares) at Dec. 31, 2020			34,684,337,000
Beginning balance at Dec. 31, 2020	$ 225,654		$ 35	$ 469,283	$ 9	$ (243,673)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Options exercised (in shares)			159,325,000
Exercise of stock options	773			773
Unrealized gain (loss) on available-for- sale securities	7				7
Issuance of common stock under employee stock purchase plan, share (in shares)			20,594,000
Issuance of common stock under employee stock purchase plan	1,141			1,141
Issuance of common stock in connection with vesting of restricted stock, shares (in shares)			107,237,000
Restricted stock units withheld in net settlement for tax, shares (in shares)			(42,529,000)
Restricted stock units withheld in net settlement for tax	(5,114)			(5,114)
Stock-based compensation	5,394			5,394
Net income (loss)	(23,601)					(23,601)
Ending balance, shares (in shares) at Mar. 31, 2021			34,928,964,000
Ending balance at Mar. 31, 2021	204,254		$ 35	471,477	16	(267,274)
Beginning balance, shares (in shares) at Dec. 31, 2021			35,444,472,000
Beginning balance at Dec. 31, 2021	$ 241,830	[1]	$ 35	494,806	(202)	(252,809)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Options exercised (in shares)	54,913,000		54,913,000
Exercise of stock options	$ 391		$ 1	390
Unrealized gain (loss) on available-for- sale securities	(815)				(815)
Issuance of common stock under employee stock purchase plan, share (in shares)			14,172,000
Issuance of common stock under employee stock purchase plan	2,135			2,135
Issuance of common stock in connection with vesting of restricted stock, shares (in shares)			210,835,000
Restricted stock units withheld in net settlement for tax, shares (in shares)			(31,000)
Restricted stock units withheld in net settlement for tax	(6)			(6)
Stock-based compensation	9,767			9,767
Net income (loss)	14,521					14,521
Ending balance, shares (in shares) at Mar. 31, 2022			35,724,361,000
Ending balance at Mar. 31, 2022	$ 267,823		$ 36	$ 507,092	$ (1,017)	$ (238,288)

[1] The condensed consolidated balance sheet as of December 31, 2021 is derived from the audited consolidated financial statements as of that date.