Condensed Statements of Operations and Comprehensive Loss - USD ($)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenue
Revenue	$ 62,387
Operating expenses
Cost of revenue	34,298
Research and development expense	1,423,043	$ 1,458,375
Sales and marketing expense	190,303
General and administrative expense	1,093,687	494,955
Total operating expenses	2,741,331	1,953,330
Loss from operations	(2,678,944)	(1,953,330)
Interest expense, net	(933,032)	(13,150)
Other income	3,109
Change in fair value of warrants	(328,516)
Net loss and comprehensive loss	(3,937,383)	(1,966,480)
Accretion of redeemable convertible preferred stock	(187,086)	(79,846)
Net loss attributable to common stockholders	$ (4,124,469)	$ (2,046,326)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (1.43)	$ (0.73)
Weighted-average common shares outstanding, basic and diluted (in shares)	2,874,330	2,793,573