Quarterly report pursuant to Section 13 or 15(d)

Net Loss Per Share - Antidilutive Shares (Details)

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Net Loss Per Share - Antidilutive Shares (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities (in shares) 9,577 7,007 9,577 7,007
Options to purchase common stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities (in shares) 5,888 2,972 5,888 2,972
Restricted stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities (in shares) 293 609 293 609
Warrants for common stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities (in shares) 3,396 3,426 3,396 3,426