CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Revenues	$ 498,720	$ 402,751	$ 315,484
Cost of revenues	273,685	228,152	162,485
Gross profit	225,035	174,599	152,999
Operating expenses:
Sales and marketing	85,564	72,323	63,947
Research and development	116,952	97,381	76,273
General and administrative	77,915	70,937	56,739
Acquisition related costs	2,690	478	16,027
Amortization of acquired intangibles	17,901	17,888	6,339
Partnership termination charges	0	13,244	0
Unoccupied lease charges	2,008	2,181	420
Total operating expenses	303,030	274,432	219,745
Loss from operations	(77,995)	(99,833)	(66,746)
Other income (expense):
Interest and other income	1,476	1,207	3,672
Interest and other expense	(33,071)	(28,646)	(20,290)
Loss on extinguishment of debt	(1,513)	(8,932)	0
Total other income (expense), net	(33,108)	(36,371)	(16,618)
Loss before income taxes	(111,103)	(136,204)	(83,364)
Benefit from (provision for) income taxes	(1,643)	(1,416)	12,487
Net loss	(112,746)	(137,620)	(70,877)
Other comprehensive gain (loss):
Unrealized gain (loss) on available-for-sale investments	(213)	(118)	223
Foreign currency translation adjustment	110	72	(172)
Comprehensive loss	$ (112,849)	$ (137,666)	$ (70,826)
Net loss per common share, basic (usd per share)	$ (2.00)	$ (2.65)	$ (1.53)
Net loss per common share, diluted (usd per share)	$ (2.00)	$ (2.65)	$ (1.53)
Weighted average common shares outstanding:
Weighted-average common shares outstanding, basic (in shares)	56,394	52,019	46,198
Weighted-average common shares outstanding, diluted (in shares)	56,394	52,019	46,198