Quarterly report pursuant to Section 13 or 15(d)

Net Loss Per Share (Details)

v3.8.0.1
Net Loss Per Share (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Antidilutive securities excluded from the computation of diluted net loss per share    
Total 21,079 21,819
Employee stock option    
Antidilutive securities excluded from the computation of diluted net loss per share    
Total 20,985 21,756
Purchase Plan    
Antidilutive securities excluded from the computation of diluted net loss per share    
Total 94 63