Condensed Consolidated Statements of Redeemable Noncontrolling Interest and Stockholders’ Equity (unaudited) - USD ($) $ in Thousands	Total	Redeemable Noncontrolling Interest	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Beginning balance at Dec. 31, 2018		$ 41,800
Increase (Decrease) in Temporary Equity [Roll Forward]
Adjustment of redeemable noncontrolling interest	$ (4,700)	4,700				$ (4,700)
Ending balance at Mar. 31, 2019		46,500
Beginning balance, shares at Dec. 31, 2018			85,832,454
Beginning balance at Dec. 31, 2018	483,152		$ 1	$ 764,033	$ (83)	(280,799)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options, shares			146,318
Issuance of common stock upon exercise of stock options	538			538
Vesting of common stock exercised early	56			56
Common stock issued under employee stock purchase plan (in shares)			119,702
Common stock issued under employee stock purchase plan	1,933			1,933
Stock-based compensation	3,183			3,183
Other comprehensive gain (loss), net of tax impact	416				416
Net loss	(21,351)					(21,351)
Ending balance, shares at Mar. 31, 2019			86,098,474
Ending balance at Mar. 31, 2019	468,134		$ 1	771,009	333	(303,209)
Beginning balance at Dec. 31, 2019		49,600
Increase (Decrease) in Temporary Equity [Roll Forward]
Adjustment of redeemable noncontrolling interest	4,100	(4,100)				4,100
Ending balance at Mar. 31, 2020		$ 45,500
Beginning balance, shares at Dec. 31, 2019			94,261,414
Beginning balance at Dec. 31, 2019	$ 798,393		$ 1	1,150,090	1,111	(352,809)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options, shares	242,003		242,003
Issuance of common stock upon exercise of stock options	$ 1,504			1,504
Vesting of restricted stock units (in shares)			5,594
Vesting of common stock exercised early	13			13
Stock-based compensation	6,338			6,338
Other comprehensive gain (loss), net of tax impact	6,594				6,594
Net loss	(31,829)					(31,829)
Ending balance, shares at Mar. 31, 2020			94,509,011
Ending balance at Mar. 31, 2020	$ 785,113		$ 1	$ 1,157,945	$ 7,705	$ (380,538)