Condensed Statements of Operations - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue:
Product	$ 625,605	$ 506,065	$ 1,573,926	$ 1,683,382
Service	3,097,879	407,836	5,281,483	1,991,567
Total revenue	3,723,484	913,901	6,855,409	3,674,949
Cost of revenue	1,088,987	1,125,009	3,621,193	2,901,455
Gross margin	2,634,497	(211,108)	3,234,216	773,494
Operating expenses:
Selling, general and administrative	4,258,347	3,937,600	12,910,251	13,343,945
Research and development	3,478,419	1,910,116	6,364,371	6,515,808
Total operating expenses	7,736,766	5,847,716	19,274,622	19,859,753
Operating loss	(5,102,269)	(6,058,824)	(16,040,406)	(19,086,259)
Other income (expense):
Interest expense	(300,272)	(490,825)	(1,048,750)	(1,422,171)
Interest income	22,438	26,196	52,149	92,767
Total other income (expense)	(277,834)	(429,618)	(996,593)	(1,275,951)
Other income		35,011	8	53,453
Net loss before income taxes	(5,380,103)	(6,488,442)	(17,036,999)	(20,362,210)
Provision for income taxes	743		1,023	4,259
Net loss	$ (5,380,846)	$ (6,488,442)	$ (17,038,022)	$ (20,366,469)
Net loss per share, basic and diluted	$ (0.46)	$ (0.92)	$ (1.74)	$ (2.92)
Shares used in computing net loss per share, basic and diluted	11,603,617	7,053,010	9,794,651	6,985,924