Annual report pursuant to Section 13 and 15(d)

Net Loss Per Share of Common Stock (Details 1)

v3.8.0.1
Net Loss Per Share of Common Stock (Details 1) - shares
shares in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities 7,168 4,440 5,802
Options to purchase common stock [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities 3,156 2,477 1,963
Restricted stock units [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities 616 0 0
Warrants for common stock [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities 3,396 1,963 1,963
Common stock issuable upon conversion of preferred shares [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities 0 0 1,876