Condensed Statements of Operations - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenue:
Product	$ 506,065	$ 973,956	$ 1,683,382	$ 2,349,740
Service	407,836	37,000	1,991,567	150,292
Other				325,789
Total revenue	913,901	1,010,956	3,674,949	2,825,821
Cost of revenue	1,125,009	809,015	2,901,455	2,538,590
Gross margin	(211,108)	201,941	773,494	287,231
Operating expenses:
Selling, general and administrative	3,937,600	3,717,402	13,343,945	10,883,161
Research and development	1,910,116	1,309,573	6,515,808	2,951,009
Total operating expenses	5,847,716	5,026,975	19,859,753	13,834,170
Operating loss	(6,058,824)	(4,825,034)	(19,086,259)	(13,546,939)
Other income (expense):
Loss from change in stock warrant valuation	0	0	0	(239,683)
Interest expense	(490,825)	(378,656)	(1,422,171)	(1,334,103)
Interest income	26,196	37,788	92,767	48,930
Loss on settlement of convertible debt				(705,217)
Other	35,011	8,239	53,453	78,873
Total other income (expense)	(429,618)	(332,629)	(1,275,951)	(2,151,200)
Net loss before income taxes	(6,488,442)	(5,157,663)	(20,362,210)	(15,698,139)
Income taxes			4,259
Net loss	(6,488,442)	(5,157,663)	(20,366,469)	(15,698,139)
Accretion of stock issuance costs				(35,046)
Accretion of Series E warrant discount				(127,616)
Accretion of Series D and E redeemable convertible preferred stock dividends				(1,165,932)
Net loss attributable to common stockholders	$ (6,488,442)	$ (5,157,663)	$ (20,366,469)	$ (17,026,733)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.92)	$ (0.76)	$ (2.92)	$ (4.56)
Shares used in computing net loss per share attributable to common stockholders, basic and diluted	7,053,010	6,829,687	6,985,924	3,735,852