Stockholders' equity (deficit) (Tables)

3 Months Ended

Mar. 31, 2015

Stockholders' equity (deficit)

Schedule of allocation of share-based compensation expense

	Three months ended March 31,
	2015		2014
Research and development	$	36,456	$	6,094
General and administrative	83,299		22,060
Sales and marketing	470,848		773
	$	590,603	$	28,927