Condensed Statements of Operations - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenue:
Product	$ 600,190	$ 727,438
Service	265,042	62,292
Other		234,585
Total revenue	865,232	1,024,315
Cost of revenue	843,470	894,627
Gross margin	21,762	129,688
Operating expenses:
Selling, general and administrative	4,693,708	3,439,269
Research and development	1,994,101	688,214
Total operating expenses	6,687,809	4,127,483
Operating loss	(6,666,047)	(3,997,795)
Other income (expense):
Gain from change in stock warrant valuation		388,960
Interest expense	(392,457)	(479,375)
Interest income	35,479	76
Total other income (expense)	(356,978)	(90,339)
Net loss before income taxes	(7,023,025)	(4,088,134)
Income taxes	3,399
Net loss	(7,026,424)	(4,088,134)
Accretion of stock issuance costs		(24,077)
Accretion of Series E warrant discount		(87,470)
Accretion of Series D and E redeemable convertible preferred stock dividends		(798,582)
Net loss attributable to common stockholders	$ (7,026,424)	$ (4,998,263)
Net loss per share attributable to common stockholders, basic and diluted	$ (1.02)	$ (14.99)
Shares used in computing net loss per share attributable to common stockholders, basic and diluted	6,885,522	333,408