Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue:
Product revenue	$ 65,155	$ 19,590	$ 152,963	$ 45,073
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Cost of revenue:
Cost of product revenue	$ 10,949	$ 5,277	$ 28,775	$ 14,520
Type of Cost, Good Or Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit	$ 54,206	$ 14,313	$ 124,188	$ 30,553
Operating expenses:
Research and development	13,735	7,891	35,827	27,882
Sales and marketing	28,393	13,619	78,098	35,236
General and administrative	9,265	5,610	25,117	17,232
Total operating expenses	51,393	27,120	139,042	80,350
Income (loss) from operations	2,813	(12,807)	(14,854)	(49,797)
Share in net loss of equity method investment	(342)		(5,865)
Interest expense	(165)	(314)	(795)	(897)
Other income (expense), net	(280)	218	(369)	942
Net income (loss) before taxes	2,026	(12,903)	(21,883)	(49,752)
Income tax provision	78	29	195	73
Net income (loss)	1,948	(12,932)	(22,078)	(49,825)
Other comprehensive income (loss):
Unrealized gain/(loss) on available-for-sale securities	(17)		(16)	(14)
Adjustment for net gain realized and included in other income, net		(21)		(21)
Total other comprehensive income (loss)	(17)	(21)	(16)	(35)
Total comprehensive income (loss)	$ 1,931	$ (12,953)	$ (22,094)	$ (49,860)
Net income (loss) per share
Basic	$ 0.06	$ (0.38)	$ (0.63)	$ (1.53)
Diluted	$ 0.05	$ (0.38)	$ (0.63)	$ (1.53)
Shares used in computing net income (loss) per share
Basic	35,207,276	34,078,726	35,013,072	32,631,715
Diluted	37,567,176	34,078,726	35,013,072	32,631,715