Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Financial Statements Detail - Outstanding Securities Considered Anti-Dilutive (Details)

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Condensed Consolidated Financial Statements Detail - Outstanding Securities Considered Anti-Dilutive (Details) - shares
shares in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 6,665 3,480
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) 1,645 653
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) 17 381
Convertible Preferred Stock [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 5,003 2,446