Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue:
Total revenue	$ 14,224	$ 30,167	$ 28,474	$ 50,451
Cost of revenue:
Total cost of revenue	15,266	26,921	31,623	52,569
Gross margin	(1,042)	3,246	(3,149)	(2,118)
Operating expenses:
Research and development	6,211	6,463	12,548	11,494
Selling and marketing	3,093	7,663	8,916	12,548
General and administrative	15,227	15,398	31,015	30,507
Total operating expenses	24,531	29,524	52,479	54,549
Loss from operations	(25,573)	(26,278)	(55,628)	(56,667)
Interest income	87	687	782	907
Interest expense	(1,071)	(1,074)	(2,109)	(1,833)
Other income (expense), net	405	(4,133)	3,271	(6,566)
Loss before provision for income taxes	(26,152)	(30,798)	(53,684)	(64,159)
Provision for income taxes	0	0	0	0
Net loss and comprehensive loss	$ (26,152)	$ (30,798)	$ (53,684)	$ (64,159)
Net loss per share, basic and diluted	$ (0.18)	$ (0.32)	$ (0.36)	$ (0.66)
Weighted-average common shares used to compute net loss per share attributable to common stockholders, basic and diluted	147,563,278	97,572,389	147,506,244	97,129,389
Product
Revenue:
Total revenue	$ 10,615	$ 27,905	$ 22,085	$ 46,779
Cost of revenue:
Total cost of revenue	12,714	22,814	25,843	44,847
Service
Revenue:
Total revenue	3,490	2,143	6,151	3,434
Cost of revenue:
Total cost of revenue	2,552	4,107	5,780	7,722
Distribution Rights
Revenue:
Total revenue	$ 119	$ 119	$ 238	$ 238