Net loss per share

3 Months Ended

Mar. 31, 2018

14. Net loss per share

For all periods presented, both basic and diluted net loss per common share are computed by dividing the net loss by the number of weighted average common shares outstanding during the period. Stock options, awards and potential common shares issuable upon conversion of the 2018 Notes and 2020 Notes were excluded from the computation of diluted net loss per share, as their share effect was anti-dilutive for all periods presented.

The following potential common shares were excluded from the calculations as their effect would be anti-dilutive:


	Three Months Ended
	March 31,
	2018	2017
Outstanding stock options and awards	13,104,711	12,598,407
Common shares issuable upon conversion of the 2018 Notes	148,836	505,004
Common shares issuable upon conversion of the 2020 Notes	368,939	407,000
Total potential common shares excluded from diluted net loss per share computation	13,622,486	13,510,411