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Organization and Summary of Significant Accounting Policies - Anti-Dilutive Securities Excluded in the Determination of Diluted Income (Loss) Per Share (Details) - shares
shares in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Outstanding stock options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Number of anti-dilutive securities (in shares) 391 490
Outstanding warrants    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Number of anti-dilutive securities (in shares) 7,270 2,318
Restricted stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Number of anti-dilutive securities (in shares) 721 116