Warrants - Background Information (Details) - USD ($)				12 Months Ended
	Dec. 04, 2017	Nov. 03, 2014	Oct. 29, 2013	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Nov. 30, 2016	Nov. 09, 2016
Warrants
Warrants outstanding beginning balance				337,696	272,468	230,409
Warrants issued				1,890,602	65,228	42,059
Warrants exercised				(129,149)
Warrants outstanding ending balance				2,099,149	337,696	272,468
Weighted average exercise price
Beginning balance (in dollars per share)				$ 3.06	$ 2.02	$ 1.30
Issued (in dollars per share)				5.33	7.41	5.94
Exercised (in dollars per share)				1.30
Ending balance (in dollars per share)				$ 5.21	$ 3.06	$ 2.02
Value of warrants issued					$ 264,365
Common warrants
Warrants
Warrants issued	1,783,587
Weighted average exercise price
Ending balance (in dollars per share)	$ 5.25
Placement agent warrants
Warrants
Warrants issued	107,015
Weighted average exercise price
Ending balance (in dollars per share)	$ 6.6562
Term Loan
Weighted average exercise price
Common stock to be issued if warrants are exercised (in shares)							65,228	65,228
June 2013 Notes
Weighted average exercise price
Exercised (in dollars per share)			$ 1.30
Common stock to be issued if warrants are exercised (in shares)			230,409
September 2014 Notes
Weighted average exercise price
Ending balance (in dollars per share)		$ 5.94
Common stock to be issued if warrants are exercised (in shares)		42,059
Fair value of warrant recorded as a debt discount		$ 79,129
Mandatory conversion, warrant price premium as a percent of the conversion price		10.00%