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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) 6,649 1,157 6,657 5,142
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   5,003 3,732
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) 1,625 1,138 1,635 1,391
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) 21 19 19 19