Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenue:
Revenue	$ 35,805	$ 31,080
Costs and expenses:
Cost of product revenue	22,871	14,778
Research and development	16,118	17,417
Selling, general and administrative	37,366	36,355
Total costs and expenses	76,355	68,550
Loss from operations	(40,550)	(37,470)
Other income (expense):
Interest income	1,285	151
Interest expense	(1,891)	(1,883)
Other income (expense), net	(7)	(217)
Total other expense, net	(613)	(1,949)
Net loss before provision for income tax	(41,163)	(39,419)
Provision for income tax	(75)	(81)
Net loss	$ (41,238)	$ (39,500)
Net loss per share - basic (in dollars per share)	$ (0.88)	$ (0.86)
Net loss per share - diluted (in dollars per share)	$ (0.88)	$ (0.86)
Weighted average shares used in computing basic net loss per share (in shares)	46,936	45,998
Weighted average shares used in computing diluted net loss per share (in shares)	46,936	45,998
Total product revenue
Revenue:
Revenue	$ 31,146	$ 26,571
Costs and expenses:
Cost of product revenue	17,605	11,472
Service and other revenue
Revenue:
Revenue	4,659	4,509
Costs and expenses:
Cost of product revenue	$ 5,266	$ 3,306