Net loss per share (Tables)

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

Schedule of Antidilutive Securities Excluded from Computation of Basic and Diluted Net Loss Per Share

The following have been excluded from the computation of basic and diluted net loss per share as their effect would have been antidilutive:

	THREE MONTHS ENDED MARCH 31,
	2016		2015
Outstanding stock options		1,255,573		1,056,892
Common stock warrants		11,363		11,363
Total		1,266,936		1,068,255