Condensed Consolidated Statements of Changes in Stockholders' (Deficit) - USD ($) shares in Thousands, $ in Thousands	Common Stock Cumulative effect, period of adoption, adjustment	Common Stock	Additional Paid-In Capital Cumulative effect, period of adoption, adjustment	Additional Paid-In Capital	Accumulated Other Comprehensive Loss, Net Cumulative effect, period of adoption, adjustment	Accumulated Other Comprehensive Loss, Net	Accumulated Deficit Cumulative effect, period of adoption, adjustment	Accumulated Deficit	Cumulative effect, period of adoption, adjustment	Total
Balance at Dec. 31, 2020		$ 33		$ 2,233,937		$ (2,477)		$ (2,398,346)		$ (166,853)
Balance (in shares) at Dec. 31, 2020		33,016
Stock-based compensation		$ 0		16,867		0		0		16,867
Net proceeds from exercise of stock options		$ 0		18		0		0		18
Net proceeds from exercise of stock options (in shares)		188
Employee withholding taxes related to stock-based awards		$ 0		(1,325)		0		0		(1,325)
Employee withholding taxes related to stock-based awards, (in shares)		(3)
Other comprehensive income (loss)		$ 0		0		(388)		0		(388)
Net loss		0		0		0		(51,514)		(51,514)
Balance at Jun. 30, 2021		$ 33		2,249,497		(2,865)		(2,449,860)		(203,195)
Balance (in shares) at Jun. 30, 2021		33,201
Balance at Mar. 31, 2021		$ 33		2,241,273		(2,538)		(2,438,766)		(199,998)
Balance (in shares) at Mar. 31, 2021		33,154
Stock-based compensation		$ 0		8,448		0		0		8,448
Net proceeds from exercise of stock options		$ 0		18		0		0		18
Net proceeds from exercise of stock options (in shares)		47
Employee withholding taxes related to stock-based awards		$ 0		(242)		0		0		(242)
Employee withholding taxes related to stock-based awards, (in shares)		0
Other comprehensive income (loss)		$ 0		0		(327)		0		(327)
Net loss		0		0		0		(11,094)		(11,094)
Balance at Jun. 30, 2021		$ 33		2,249,497		(2,865)		(2,449,860)		(203,195)
Balance (in shares) at Jun. 30, 2021		33,201
Balance at Dec. 31, 2021		$ 30		2,308,653		(2,873)		(2,489,772)		(183,962)
Balance (in shares) at Dec. 31, 2021		29,573
Stock-based compensation		$ 0		15,264		0		0		15,264
Issuance of common stock under equity plan		$ 0		0		0		0		$ 0
Issuance of common stock under equity plan (in shares)		251
Net proceeds from exercise of stock options (in shares)										0
Employee withholding taxes related to stock-based awards		$ 0		(345)		0		0		$ (345)
Employee withholding taxes related to stock-based awards, (in shares)		(26)
Other comprehensive income (loss)		$ 0		0		325		0		325
Net loss		0		0		0		(24,812)		(24,812)
Balance at Jun. 30, 2022	$ 0	$ 30	$ (307,371)	2,016,201	$ 0	(2,548)	$ 131,068	(2,383,516)	$ (176,303)	(369,833)
Balance (in shares) at Jun. 30, 2022		29,798
Balance at Mar. 31, 2022		$ 30		2,007,684		(3,487)		(2,375,988)		(371,761)
Balance (in shares) at Mar. 31, 2022		29,709
Stock-based compensation		$ 0		8,544		0		0		8,544
Issuance of common stock under equity plan		$ 0		0		0		0		0
Issuance of common stock under equity plan (in shares)		96
Employee withholding taxes related to stock-based awards		$ 0		(27)		0		0		(27)
Employee withholding taxes related to stock-based awards, (in shares)		(7)
Other comprehensive income (loss)		$ 0		0		939		0		939
Net loss		0		0		0		(7,528)		(7,528)
Balance at Jun. 30, 2022	$ 0	$ 30	$ (307,371)	$ 2,016,201	$ 0	$ (2,548)	$ 131,068	$ (2,383,516)	$ (176,303)	$ (369,833)
Balance (in shares) at Jun. 30, 2022		29,798