Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock	Treasury Shares/Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income	Total
Beginning balance (in shares) at Dec. 31, 2019	94,972	(121)
Beginning balance at Dec. 31, 2019	$ 9	$ (441)	$ 374,525	$ (286,066)	$ 410	$ 88,437
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss				(5,942)		(5,942)
Other comprehensive income					498	498
Stock-based compensation			1,066			1,066
Issuance of common stock, RSUs (in shares)	178
Issuance of common stock, RSUs	$ 1		(1)
Proceeds from the exercise of stock options and ESPP (in shares)	112
Proceeds from the exercise of stock options and ESPP			76			76
Ending balance (in shares) at Mar. 31, 2020	95,262	(121)
Ending balance at Mar. 31, 2020	$ 10	$ (441)	375,666	(292,008)	908	84,135
Beginning balance (in shares) at Dec. 31, 2019	94,972	(121)
Beginning balance at Dec. 31, 2019	$ 9	$ (441)	374,525	(286,066)	410	88,437
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss						(11,299)
Other comprehensive income						(49)
Ending balance (in shares) at Jun. 30, 2020	95,700	(121)
Ending balance at Jun. 30, 2020	$ 10	$ (441)	376,944	(297,365)	361	79,509
Beginning balance (in shares) at Mar. 31, 2020	95,262	(121)
Beginning balance at Mar. 31, 2020	$ 10	$ (441)	375,666	(292,008)	908	84,135
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss				(5,357)		(5,357)
Other comprehensive income					(547)	(547)
Stock-based compensation			1,278			1,278
Issuance of common stock, RSUs (in shares)	438
Ending balance (in shares) at Jun. 30, 2020	95,700	(121)
Ending balance at Jun. 30, 2020	$ 10	$ (441)	376,944	(297,365)	361	79,509
Beginning balance (in shares) at Dec. 31, 2020	97,248	(121)
Beginning balance at Dec. 31, 2020	$ 10	$ (441)	379,696	(304,607)	618	75,276
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss				(8,835)		(8,835)
Other comprehensive income					325	325
Stock-based compensation			2,486			2,486
Issuance of common stock, RSUs (in shares)	73
Proceeds from the exercise of stock options and ESPP (in shares)	149
Proceeds from the exercise of stock options and ESPP			132			132
Ending balance (in shares) at Mar. 31, 2021	97,470	(121)
Ending balance at Mar. 31, 2021	$ 10	$ (441)	382,314	(313,442)	943	69,384
Beginning balance (in shares) at Dec. 31, 2020	97,248	(121)
Beginning balance at Dec. 31, 2020	$ 10	$ (441)	379,696	(304,607)	618	75,276
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss						(13,926)
Other comprehensive income						356
Ending balance (in shares) at Jun. 30, 2021	97,959	(121)
Ending balance at Jun. 30, 2021	$ 10	$ (441)	383,403	(318,533)	974	65,413
Beginning balance (in shares) at Mar. 31, 2021	97,470	(121)
Beginning balance at Mar. 31, 2021	$ 10	$ (441)	382,314	(313,442)	943	69,384
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss				(5,091)		(5,091)
Other comprehensive income					31	31
Stock-based compensation			1,085			1,085
Issuance of common stock, RSUs (in shares)	485
Proceeds from the exercise of stock options and ESPP (in shares)	4
Proceeds from the exercise of stock options and ESPP			4			4
Ending balance (in shares) at Jun. 30, 2021	97,959	(121)
Ending balance at Jun. 30, 2021	$ 10	$ (441)	$ 383,403	$ (318,533)	$ 974	$ 65,413