Net Loss per Common Share (Tables)

12 Months Ended

Dec. 31, 2017

Net Loss per Common Share

Computation of basic and diluted net loss per common share

	Year ended December 31,
	2017		2016		2015
Basic and diluted net loss per common share:
Net loss	$	(28,943,392)	$	(27,201,653)	$	(12,210,579)
Weighted average common shares outstanding—basic and diluted		22,764,606		19,150,690		11,945,318
Net loss per common share—basic and diluted	$	(1.27)	$	(1.42)	$	(1.02)

Schedule of potentially dilutive securities

	December 31,
	2017	2016	2015
Stock options	2,315,638	1,772,050	998,198
Warrants	2,099,149	337,696	272,468
	4,414,787	2,109,746	1,270,666