Annual report pursuant to Section 13 and 15(d)

Net Loss per Share of Common Stock - Outstanding Securities Considered Anti-Dilutive (Details)

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Net Loss per Share of Common Stock - Outstanding Securities Considered Anti-Dilutive (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation of earnings per share (in shares) 1,442 1,510 428
Common Stock Options and RSUs [Member]      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation of earnings per share (in shares) 548 550 324
Warrants for Common Stock [Member]      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation of earnings per share (in shares) 894 960 104