Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue:
Total revenue	$ 30,167	$ 16,443	$ 50,451	$ 42,633
Cost of revenue:
Total cost of revenue	26,921	16,374	52,569	36,994
Gross margin	3,246	69	(2,118)	5,639
Operating expenses:
Research and development	6,463	4,389	11,494	8,159
Selling and marketing	7,663	3,394	12,548	6,640
General and administrative	15,398	10,503	30,507	20,349
Total operating expenses	29,524	18,286	54,549	35,148
Loss from operations	(26,278)	(18,217)	(56,667)	(29,509)
Interest income	687	2	907	4
Interest expense	(1,074)	(1,918)	(1,833)	(3,784)
Other (expense) income, net	(4,133)	(1,857)	(6,566)	6,485
Loss before provision for income taxes	(30,798)	(21,990)	(64,159)	(26,804)
Provision for income taxes	0	0	0	0
Net loss and comprehensive loss	(30,798)	(21,990)	(64,159)	(26,804)
Amortization of beneficial conversion feature related to Series A convertible preferred stock	0	0	0	(2,728)
Net loss attributable to common stockholders, basic and diluted	$ (30,798)	$ (21,990)	$ (64,159)	$ (29,532)
Net loss per share, basic and diluted	$ (0.32)	$ (0.30)	$ (0.66)	$ (0.41)
Weighted-average common shares used to compute net loss per share attributable to common stockholders, basic and diluted	97,572,389	74,531,274	97,129,389	71,776,802
Product
Revenue:
Total revenue	$ 27,905	$ 15,366	$ 46,779	$ 40,745
Cost of revenue:
Total cost of revenue	22,814	14,654	44,847	34,365
Service
Revenue:
Total revenue	2,143	958	3,434	1,650
Cost of revenue:
Total cost of revenue	4,107	1,720	7,722	2,629
Distribution Rights
Revenue:
Total revenue	$ 119	$ 119	$ 238	$ 238