Condensed Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Revenue:
Product	$ 3,532,028	$ 1,788,205
Service	183,758	497,168
Other	325,789	1,043,584
Total revenue	4,041,575	3,328,957
Cost of revenue	3,335,511	3,204,915
Gross margin	706,064	124,042
Operating expenses:
Selling, general and administrative	14,994,410	9,897,697
Research and development	4,601,718	3,075,204
Total operating expenses	19,596,128	12,972,901
Operating loss	(18,890,064)	(12,848,859)
Other income (expense):
Loss from change in stock warrant valuation	(239,683)	(388,936)
Interest expense	(1,719,475)	(706,866)
Interest income	85,859
Loss on settlement of convertible debt	(705,217)
Other	80,978	(13,747)
Total other expense	(2,497,538)	(1,109,549)
Net loss before income taxes	(21,387,602)	(13,958,408)
Income taxes	10,189
Net loss	(21,397,791)	(13,958,408)
Accretion of stock issuance costs	(35,046)	(102,677)
Accretion of Series E warrant discount	(127,616)	(313,152)
Accretion of Series D and E redeemable convertible preferred stock dividends	(1,165,932)	(3,244,572)
Net loss attributable to common stockholders	$ (22,726,385)	$ (17,618,809)
Net loss per share attributable to common stockholders, basic and diluted	$ (5.03)	$ (175.03)
Shares used in computing net loss per share attributable to common stockholders, basic and diluted	4,518,499	100,659