Net loss per share (Tables)

6 Months Ended

Jun. 30, 2017

Net loss per share

Schedule of potentially anti-dilutive securities excluded from calculation of diluted net loss per share

	Three months ended		Six months ended
	June 30,		June 30,
	2017	2016	2017	2016
Outstanding stock options	7,573,155	6,691,059	7,573,155	6,691,059
Outstanding warrants	—	142,857	—	142,857
	7,573,155	6,833,916	7,573,155	6,833,916