Annual report pursuant to Section 13 and 15(d)

Net Loss per Share (Details)

v3.3.1.900
Net Loss per Share (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Total anti-dilutive securities 6,007 6,268 6,797
Shares issuable under Equity Incentive Plan      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Total anti-dilutive securities 5,932 6,193 6,722
Warrant      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Total anti-dilutive securities 75 75 75