Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue:
Product				$ 5,240
Service	$ 579	$ 299	$ 1,687	515
Distribution rights	119		238
Total revenue	698	299	1,925	5,755
Cost of revenue:
Product	328	139	594	6,066
Service	498	724	1,274	1,325
Total cost of revenue	826	863	1,868	7,391
Gross margin	(128)	(564)	57	(1,636)
Operating expenses:
Research and development	3,251	2,964	6,165	6,363
Selling and marketing	1,871	1,402	2,943	2,681
General and administrative	7,463	5,788	14,614	12,108
Total operating expenses	12,585	10,154	23,722	21,152
Loss from operations	(12,713)	(10,718)	(23,665)	(22,788)
Interest income	1	0	2	1
Interest expense	(1,792)	(1,377)	(3,529)	(2,459)
Other income (expense), net	6,151	(20)	(9,122)	(237)
Loss before provision for income taxes	(8,353)	(12,115)	(36,314)	(25,483)
Provision for income taxes	0	0	0	0
Net loss	$ (8,353)	$ (12,115)	$ (36,314)	$ (25,483)
Net loss per share, basic and diluted	$ (0.15)	$ (0.32)	$ (0.67)	$ (0.67)
Weighted-average common shares used to compute net loss per share attributable to common stockholders, basic and diluted	57,230,403	38,234,703	54,540,854	38,223,071