Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share - Summary of Anti-Dilutive Equivalent Units Outstanding Excluded From Calculation of Earnings Per Share (Details)

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Earnings Per Share - Summary of Anti-Dilutive Equivalent Units Outstanding Excluded From Calculation of Earnings Per Share (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]    
Securities excluded from calculation (in shares) 13,272 9,196
Common stock purchase warrants (in shares)    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Securities excluded from calculation (in shares) 10,055 6,608
Stock options (in shares)    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Securities excluded from calculation (in shares) 2,534 2,520
Restricted shares of common stock (in shares)    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Securities excluded from calculation (in shares) 683 68