Statements of Operations and Comprehensive Loss - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Revenue
Revenue	$ 258,381
Operating Expenses
Cost of revenue	123,457
Research and development expense	6,475,851	$ 4,220,338
Sales and marketing expense	765,091
General and administrative expense	5,339,351	4,095,324
Total operating expenses	12,703,750	8,315,662
Loss from operations	(12,445,369)	(8,315,662)
Interest expense, net	(3,317,287)	(345,336)
Other expense	(27,277)
Change in fair value of warrants	(501,617)	51,423
Net loss and comprehensive loss	(16,291,550)	(8,609,575)
Accretion of redeemable convertible preferred stock	(346,374)	(646,673)
Net loss attributable to common stockholders	$ (16,637,924)	$ (9,256,248)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (2.70)	$ (3.24)
Weighted-average common shares outstanding, basic and diluted (in shares)	6,153,139	2,854,417