Statements of Convertible Preferred Stock and Changes in Stockholders' Equity (Deficit) - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Deficit Accumulated [Member]	Deficit Accumulated [Member] Convertible Preferred Stock - Series C [Member]	Deficit Accumulated [Member] Convertible Preferred Stock - Series C-1 [Member]	Deficit Accumulated [Member] Convertible Preferred Stock - Series C-2 [Member]	Total	Convertible Preferred Stock - Series A [Member]	Convertible Preferred Stock - Series B [Member]	Convertible Preferred Stock - Series B-1 [Member]	Convertible Preferred Stock - Series C [Member]	Convertible Preferred Stock - Series C-1 [Member]	Convertible Preferred Stock - Series C-2 [Member]
Balance at Dec. 31, 2012								$ 797,219	$ 2,991,979	$ 477,191	$ 0	$ 0	$ 0
Balance (in shares) at Dec. 31, 2012								864,500	2,415,116	359,935	0	0	0
Increase (Decrease) in Convertible Preferred Stock [Roll Forward]
Issuance of Preferred Stock, net of issuance costs								$ 0	$ 0	$ 0	$ 15,084,682	$ 0	$ 0
Issuance of Preferred Stock, net of issuance costs (in shares)								0	0	0	4,631,505	0	0
Dividend Preferred Stock								$ 0	$ 0	$ 0	$ 1,076,256	$ 0	$ 0
Balance at Dec. 31, 2013								$ 797,219	$ 2,991,979	$ 477,191	$ 16,414,303	$ 0	$ 0
Balance (in shares) at Dec. 31, 2013								864,500	2,415,116	359,935	4,697,314	0	0
Balance at Dec. 31, 2012	$ 770	$ 426,053	$ (8,077,493)				$ (7,650,670)
Balance (in shares) at Dec. 31, 2012	1,688,475
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock based compensation expense	$ 0	260,361	0				260,361
Dividend, Preferred Stock				$ (1,076,256)							$ (1,076,256)
Conversion of loans payable to Series C Preferred Stock								$ 0	$ 0	$ 0	$ 253,365	$ 0	$ 0
Conversion of loans payable to Series C Preferred Stock (in shares)								0	0	0	65,809	0	0
Net loss	0	0	(6,883,080)				(6,883,080)
Balance at Dec. 31, 2013	$ 770	686,414	(16,036,829)				(15,349,645)
Balance (in shares) at Dec. 31, 2013	1,688,475
Increase (Decrease) in Convertible Preferred Stock [Roll Forward]
Issuance of Preferred Stock, net of issuance costs								$ 0	$ 0	$ 0	$ 0	$ 14,527,016	$ 0
Issuance of Preferred Stock, net of issuance costs (in shares)								0	0	0	0	3,558,890	0
Dividend Preferred Stock								$ 0	$ 0	$ 0	$ 1,446,773	$ 133,928	$ 0
Balance at Dec. 31, 2014								$ 797,219	$ 2,991,979	$ 477,191	$ 17,861,076	$ 14,660,944	$ 0
Balance (in shares) at Dec. 31, 2014								864,500	2,415,116	359,935	4,697,314	3,558,890	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock based compensation expense	$ 0	1,297,985	0				1,297,985
Dividend, Preferred Stock				(1,446,773)	$ (133,928)						$ (1,446,773)	$ (133,928)
Net loss	0	0	(12,201,386)				(12,201,386)
Balance at Dec. 31, 2014	$ 770	1,984,399	(29,818,916)				(27,833,747)
Balance (in shares) at Dec. 31, 2014	1,688,475
Increase (Decrease) in Convertible Preferred Stock [Roll Forward]
Issuance of Preferred Stock, net of issuance costs								$ 0	$ 0	$ 0	$ 0	$ 0	$ 52,217,328
Issuance of Preferred Stock, net of issuance costs (in shares)								0	0	0	0	0	12,043,006
Other								$ 0	$ 0	$ 0	$ 0	$ 2,130	$ 0
Dividend Preferred Stock											1,101,926	1,008,346	2,246,136
Conversion of Preferred Stock to Common Stock upon initial public offering								$ (797,219)	$ (2,991,979)	$ (477,191)	$ (18,963,002)	$ (15,671,420)	$ (54,463,464)
Conversion of Preferred Stock to Common Stock upon initial public offering (in shares)								(864,500)	(2,415,116)	(359,935)	(4,697,314)	(3,558,890)	(12,043,006)
Balance at Dec. 31, 2015								$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Balance (in shares) at Dec. 31, 2015								0	0	0	0	0	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock based compensation expense	$ 0	2,899,304	0				2,899,304
Dividend, Preferred Stock				$ (1,101,926)	$ (1,008,346)	$ (2,246,136)					$ (1,101,926)	$ (1,008,346)	$ (2,246,136)
Conversion of Preferred Stock to Common Stock upon initial public offering	$ 6,127	93,358,148	0				93,364,275
Conversion of Preferred Stock to Common Stock upon initial public offering (in shares)	18,566,856
Initial public offering of common stock, net of issuance costs	$ 2,776	82,752,836	0				82,755,612
Initial public offering of common stock, net of issuance costs (in shares)	8,412,423
Conversion of Preferred Stock Warrant to Common Stock Warrant	$ 0	3,726,043	0				3,726,043
Issuance of common stock from exercise of stock options	$ 1	1,093	0				1,094
Issuance of common stock from exercise of stock options (in shares)	4,753
Issuance of common stock from exercise of warrants	$ 46	(46)	0				0
Issuance of common stock from exercise of warrants (in shares)	138,338
Net loss	$ 0	0	(28,078,646)				(28,078,646)
Balance at Dec. 31, 2015	$ 9,720	$ 184,721,777	$ (62,253,970)				$ 122,477,527
Balance (in shares) at Dec. 31, 2015	28,810,845