CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Noncontrolling Interests
Balance at Dec. 31, 2020	$ 103,806	$ 168	$ 1,012,932	$ 674	$ (909,968)
Balance (in shares) at Dec. 31, 2020		168,170,000
Issuance of common stock from exercise of stock options, vesting of restricted stock units, and ESPP purchases	1,171		1,171
Issuance of common stock from exercise of stock options, vesting of restricted stock units, and ESPP purchases (in shares)		2,621,000
Stock-based compensation	5,333		5,333
Other comprehensive loss	(218)			(218)
Net loss	(17,457)				(17,457)
Balance at Mar. 31, 2021	92,635	$ 168	1,019,436	456	(927,425)
Balance (in shares) at Mar. 31, 2021		170,791,000
Balance at Dec. 31, 2020	103,806	$ 168	1,012,932	674	(909,968)
Balance (in shares) at Dec. 31, 2020		168,170,000
Net loss	(32,818)
Balance at Jun. 30, 2021	84,237	$ 172	1,026,534	317	(942,786)
Balance (in shares) at Jun. 30, 2021		171,572,000
Balance at Mar. 31, 2021	92,635	$ 168	1,019,436	456	(927,425)
Balance (in shares) at Mar. 31, 2021		170,791,000
Issuance of common stock from exercise of stock options and vesting of restricted stock units	1,294	$ 4	1,290
Issuance of common stock from exercise of stock options and vesting of restricted stock units (in shares)		781,000
Stock-based compensation	5,808		5,808
Other comprehensive loss	(139)			(139)
Net loss	(15,361)				(15,361)
Balance at Jun. 30, 2021	84,237	$ 172	1,026,534	317	(942,786)
Balance (in shares) at Jun. 30, 2021		171,572,000
Balance at Dec. 31, 2021	85,617	$ 174	1,048,936	(149)	(964,342)	$ 998
Balance (in shares) at Dec. 31, 2021		173,670,000
Issuance of common stock from exercise of stock options, vesting of restricted stock units, and ESPP purchases	2,138	$ 3	2,135
Issuance of common stock from exercise of stock options, vesting of restricted stock units, and ESPP purchases (in shares)		3,134,000
Stock-based compensation	6,426		6,426
Other comprehensive loss	(1,486)			(1,486)
Net loss	(12,284)				(12,284)
Balance at Mar. 31, 2022	80,411	$ 177	1,057,497	(1,635)	(976,626)	998
Balance (in shares) at Mar. 31, 2022		176,804,000
Balance at Dec. 31, 2021	85,617	$ 174	1,048,936	(149)	(964,342)	998
Balance (in shares) at Dec. 31, 2021		173,670,000
Net loss	(20,679)
Balance at Jun. 30, 2022	76,761	$ 177	1,062,760	(2,153)	(985,015)	992
Balance (in shares) at Jun. 30, 2022		177,078
Balance at Mar. 31, 2022	80,411	$ 177	1,057,497	(1,635)	(976,626)	998
Balance (in shares) at Mar. 31, 2022		176,804,000
Issuance of common stock from exercise of stock options and vesting of restricted stock units	256		256
Issuance of common stock from exercise of stock options and vesting of restricted stock units (in shares)		274,000
Stock-based compensation	5,007		5,007
Other comprehensive loss	(518)			(518)
Net loss	(8,395)				(8,389)	(6)
Balance at Jun. 30, 2022	$ 76,761	$ 177	$ 1,062,760	$ (2,153)	$ (985,015)	$ 992
Balance (in shares) at Jun. 30, 2022		177,078