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Accounting Policies - Common Stock Equivalents Excluded From Computation of Net Loss Per Share (Details) - shares
shares in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Share-based Payment Arrangement, Option    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Shares excluded (in shares) 13,079 12,300
Warrant    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Shares excluded (in shares) 640 640
Convertible Debt Securities    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Shares excluded (in shares) 8,860 8,348