Condensed Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Condensed Statements of Operations and Comprehensive Loss [Abstract]
Revenue	$ 28,021	$ 22,053
Cost of goods sold	8,577	5,538
Gross profit	19,444	16,515
Operating expenses:
Research and development	8,123	5,484
Selling, general and administrative	27,275	21,194
Total operating expenses	35,398	26,678
Loss from operations	(15,954)	(10,163)
Interest income	12	95
Interest expense	(621)	(623)
Other income (expense), net	(116)	(3)
Net loss	(16,679)	(10,694)
Other comprehensive loss:
Change in unrealized gain (loss) on investments, net		(33)
Net change in other comprehensive loss		(33)
Net loss and comprehensive loss	$ (16,679)	$ (10,727)
Net loss per share, basic and diluted	$ (0.48)	$ (0.31)
Weighted average common shares used to compute net loss per share, basic and diluted	35,023,297	34,336,433