Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue:
Revenue	$ 44,157	$ 32,219	$ 79,962	$ 63,299
Costs and expenses:
Cost of product revenue	29,757	15,852	52,628	30,630
Research and development	18,214	17,346	34,332	34,763
Selling, general and administrative	39,076	36,112	76,442	72,467
Total costs and expenses	87,047	69,310	163,402	137,860
Loss from operations	(42,890)	(37,091)	(83,440)	(74,561)
Other income (expense):
Interest income	1,527	406	2,812	557
Interest expense	(1,889)	(1,880)	(3,780)	(3,763)
Other income (expense), net	(211)	(490)	(218)	(707)
Total other expense, net	(573)	(1,964)	(1,186)	(3,913)
Net loss before provision for income tax	(43,463)	(39,055)	(84,626)	(78,474)
Provision for income tax	(205)	(184)	(280)	(265)
Net loss	$ (43,668)	$ (39,239)	$ (84,906)	$ (78,739)
Net loss per share - basic (in dollars per share)	$ (0.92)	$ (0.85)	$ (1.80)	$ (1.70)
Net loss per share - diluted (in dollars per share)	$ (0.92)	$ (0.85)	$ (1.80)	$ (1.70)
Weighted average shares used in computing basic net loss per share (in shares)	47,365	46,427	47,151	46,201
Weighted average shares used in computing diluted net loss per share (in shares)	47,365	46,427	47,151	46,201
Product [Member]
Revenue:
Revenue	$ 38,886	$ 27,385	$ 70,032	$ 53,956
Costs and expenses:
Cost of product revenue	25,090	11,961	42,695	23,433
Service and other revenue
Revenue:
Revenue	5,271	4,834	9,930	9,343
Costs and expenses:
Cost of product revenue	$ 4,667	$ 3,891	$ 9,933	$ 7,197