Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue:
Total revenue	$ 20,284	$ 26,190
Cost of revenue:
Total cost of revenue	25,648	20,620
Gross margin	(5,364)	5,570
Operating expenses:
Research and development	5,031	3,770
Selling and marketing	4,885	3,246
General and administrative	15,109	9,846
Total operating expenses	25,025	16,862
Loss from operations	(30,389)	(11,292)
Interest income	220	2
Interest expense	(759)	(1,866)
Other (expense) income, net	(2,433)	8,342
Loss before provision for income taxes	(33,361)	(4,814)
Provision for income taxes	0	0
Net loss and comprehensive loss	(33,361)	(4,814)
Amortization of beneficial conversion feature related to Series A convertible preferred stock	0	(2,728)
Net loss attributable to common stockholders, basic and diluted	$ (33,361)	$ (7,542)
Net loss per share, basic and diluted	$ (0.34)	$ (0.11)
Weighted-average common shares used to compute net loss per share attributable to common stockholders, basic and diluted	96,741,309	68,943,918
Product
Revenue:
Total revenue	$ 18,874	$ 25,379
Cost of revenue:
Total cost of revenue	22,033	19,711
Service
Revenue:
Total revenue	1,291	692
Cost of revenue:
Total cost of revenue	3,615	909
Distribution Rights
Revenue:
Total revenue	$ 119	$ 119