CONSOLIDATED STATEMENT OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' DEFICIT (USD $)	Total USD ($)	Common Stock USD ($)	Additional Paid-In Capital USD ($)	Accumulated Deficit USD ($)	Series A Preferred Stock	Series A Preferred Stock Preferred Stock USD ($)	Series B Preferred Stock	Series B Preferred Stock Preferred Stock USD ($)
Equity, beginning balance at Feb. 25, 2014	$ 0	$ 0	$ 0	$ 0		$ 0		$ 0
Common stock, shares outstanding, beginning balance at Feb. 25, 2014		0
Preferred stock, shares outstanding, beginning balance at Feb. 25, 2014						0		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of convertible preferred stock, net of issuance costs (in shares)						15,775,221		14,078,647
Issuance of convertible preferred stock, net of issuance costs						15,637,032		25,394,135
Sale of restricted common stock to founders	2,321		2,321
Vesting of restricted common stock (in shares)		2,202,139
Vesting of restricted common stock	0	220	(220)
Issuance of common stock from option exercises (in shares)	13,572	13,572
Issuance of common stock from option exercises	8,138	1	8,137
Stock-based compensation expense	1,462,061		1,462,061
Net loss	(8,010,860)			(8,010,860)
Equity, ending balance at Dec. 31, 2014	$ (6,538,340)	$ 221	$ 1,472,299	$ (8,010,860)		$ 15,637,032		$ 25,394,135
Preferred stock, shares outstanding, ending balance at Dec. 31, 2014					15,775,221	15,775,221	14,078,647	14,078,647
Common stock, shares outstanding, ending balance at Dec. 31, 2014	2,215,711	2,215,711