Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue:
Total revenue	$ 16,443	$ 698	$ 42,633	$ 1,925
Cost of revenue:
Total cost of revenue	16,374	826	36,994	1,868
Gross margin	69	(128)	5,639	57
Operating expenses:
Research and development	4,389	3,251	8,159	6,165
Selling and marketing	3,394	1,871	6,640	2,943
General and administrative	10,503	7,463	20,349	14,614
Total operating expenses	18,286	12,585	35,148	23,722
Loss from operations	(18,217)	(12,713)	(29,509)	(23,665)
Interest income	2	1	4	2
Interest expense	(1,918)	(1,792)	(3,784)	(3,529)
Other (expense) income, net	(1,857)	6,151	6,485	(9,122)
Loss before provision for income taxes	(21,990)	(8,353)	(26,804)	(36,314)
Provision for income taxes	0	0	0	0
Net loss and comprehensive loss	(21,990)	(8,353)	(26,804)	(36,314)
Amortization of beneficial conversion feature related to Series A convertible preferred stock	0	0	(2,728)	0
Net loss attributable to common stockholders, basic and diluted	$ (21,990)	$ (8,353)	$ (29,532)	$ (36,314)
Net loss per share, basic and diluted	$ (0.30)	$ (0.15)	$ (0.41)	$ (0.67)
Weighted-average common shares used to compute net loss per share attributable to common stockholders, basic and diluted	74,531,274	57,230,403	71,776,802	54,540,854
Product
Revenue:
Total revenue	$ 15,366	$ 0	$ 40,745	$ 0
Cost of revenue:
Total cost of revenue	14,654	328	34,365	594
Service
Revenue:
Total revenue	958	579	1,650	1,687
Cost of revenue:
Total cost of revenue	1,720	498	2,629	1,274
Distribution Rights
Revenue:
Total revenue	$ 119	$ 119	$ 238	$ 238