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Net Loss Per Share - Summary of Potential Dilutive Securities (Details) - shares
shares in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Dilutive securities (in shares) 4,541 3,587
Options to purchase Common Stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Dilutive securities (in shares) 4,494 3,538
Warrants to purchase Common Stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Dilutive securities (in shares) 47 49