Net loss per share (Tables)

6 Months Ended

Jun. 30, 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 AND SIX MONTHS ENDED JUNE 30,
	2016		2015
Outstanding stock options		1,251,114		1,067,799
Common stock warrants		11,363		11,363
		1,262,477		1,079,162