Condensed Statements of Operations - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenue:
Product	$ 973,956	$ 532,240	$ 2,349,740	$ 977,386
Service	37,000	107,183	150,292	396,840
Other		230,822	325,789	656,917
Total revenue	1,010,956	870,245	2,825,821	2,031,143
Cost of revenue	809,015	747,342	2,538,590	2,005,276
Gross margin	201,941	122,903	287,231	25,867
Operating expenses:
Selling, general and administrative	3,717,402	2,610,354	10,883,161	7,116,544
Research and development	1,309,573	649,949	2,951,009	2,372,972
Total operating expenses	5,026,975	3,260,303	13,834,170	9,489,516
Operating loss	(4,825,034)	(3,137,400)	(13,546,939)	(9,463,649)
Other income (expense):
Loss from change in stock warrant valuation	0	0	(239,683)	(56,323)
Interest expense	(378,656)	(161,069)	(1,334,103)	(292,018)
Interest income	37,788		48,930
Loss on settlement of convertible debt			(705,217)
Other	8,239	(8,860)	78,873	(7,756)
Total other income (expense)	(332,629)	(169,929)	(2,151,200)	(356,097)
Net loss before income taxes	(5,157,663)	(3,307,329)	(15,698,139)	(9,819,746)
Net loss	(5,157,663)	(3,307,329)	(15,698,139)	(9,819,746)
Accretion of stock issuance costs	0	(19,488)	(35,046)	(71,175)
Accretion of Series D and E redeemable convertible preferred stock dividends		(837,225)	(1,165,932)	(2,405,987)
Net loss attributable to common stockholders	$ (5,157,663)	$ (4,258,935)	$ (17,026,733)	$ (12,548,801)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.76)	$ (44.14)	$ (4.56)	$ (130.11)
Shares used in computing net loss per share attributable to common stockholders, basic and diluted	6,829,687	96,486	3,735,852	96,446
Series E Warrants
Other income (expense):
Accretion of Series E warrant discount	$ 0	$ (94,893)	$ (127,616)	$ (251,893)