CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Sales	$ 172,139	$ 109,236	$ 313,176	$ 207,162
Cost of sales	79,685	54,846	147,435	102,511
Gross profit	92,454	54,390	165,741	104,651
Operating expenses:
Selling, general and administrative	66,523	50,440	125,086	100,157
Research and development	20,499	15,987	38,460	30,104
Total operating expenses	87,022	66,427	163,546	130,261
Operating income (loss)	5,432	(12,037)	2,195	(25,610)
Other income (expense), net:
Interest income and other, net	418	367	690	1,093
Interest expense	(1,509)	(3,176)	(3,015)	(3,176)
Change in fair value of common stock warrants	(272)	(14,336)	(962)	(16,258)
Total other expense, net	(1,363)	(17,145)	(3,287)	(18,341)
Income (loss) before income taxes	4,069	(29,182)	(1,092)	(43,951)
Income tax expense (benefit)	61	(2,075)	(56)	(1,977)
Net income (loss)	4,008	(27,107)	(1,036)	(41,974)
Other comprehensive income (loss):
Unrealized gain (loss) on short-term investments	(51)	105	(89)	147
Foreign currency translation gain (loss)	(26)	183	(102)	(226)
Comprehensive income (loss)	$ 3,931	$ (26,819)	$ (1,227)	$ (42,053)
Net income (loss) per share, basic (usd per share)	$ 0.06	$ (0.45)	$ (0.02)	$ (0.70)
Net income (loss) per share, diluted (usd per share)	$ 0.06	$ (0.45)	$ (0.02)	$ (0.70)
Weighted average shares used to compute basic net income (loss) per share (in shares)	62,717	60,424	62,583	60,082
Weighted average shares used to compute diluted net income (loss) per share (in shares)	65,663	60,424	62,583	60,082