Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue:
Total revenue	$ 102,206	$ 70,119	$ 57,017
Cost of revenue:
Total cost of revenue	92,161	69,784	61,076
Gross profit (loss)	10,045	335	(4,059)
Operating expenses:
Research and development	32,431	31,849	25,008
Selling and marketing	30,488	16,044	15,181
General and administrative	52,437	56,091	61,729
Impairment charges	1,816	0	0
Total operating expenses	117,172	103,984	101,918
Loss from operations	(107,127)	(103,649)	(105,977)
Interest income	1,686	13	791
Interest expense	(5,057)	(4,241)	(3,307)
Other income (expense), net	3,168	(2,171)	585
Loss before provision for income taxes	(107,330)	(110,048)	(107,908)
Provision for income taxes	0	0	0
Net loss attributable to common stockholders, basic and diluted	$ (107,330)	$ (110,048)	$ (107,908)
Net loss per share, basic (USD per share)	$ (0.59)	$ (0.67)	$ (0.73)
Net loss per share, diluted (USD per share)	$ (0.59)	$ (0.67)	$ (0.73)
Weighted-average common shares used in computing net loss per share, diluted (in shares)	180,697,230	164,521,064	147,895,561
Weighted-average common shares used in computing net loss per share, basic (in shares)	180,697,230	164,521,064	147,895,561
Product
Revenue:
Total revenue	$ 79,325	$ 51,865	$ 42,742
Cost of revenue:
Total cost of revenue	71,238	51,780	49,347
Service
Revenue:
Total revenue	22,368	17,779	13,800
Cost of revenue:
Total cost of revenue	20,923	18,004	11,729
Distribution rights
Revenue:
Total revenue	$ 513	$ 475	$ 475