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Summary of Significant Accounting Policies - Antidilutive Securities Table (Details) - shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Summary of common shares that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect      
Total antidilutive securities (shares) 8,937,494 7,897,564 6,377,633
Options to purchase common stock      
Summary of common shares that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect      
Total antidilutive securities (shares) 7,694,870 6,806,183 5,862,364
Warrants to purchase common stock      
Summary of common shares that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect      
Total antidilutive securities (shares) 0 284,091 276,813
Restricted stock units      
Summary of common shares that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect      
Total antidilutive securities (shares) 1,234,168 798,834 230,000
Convertible preferred stock      
Summary of common shares that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect      
Total antidilutive securities (shares) 8,456 8,456 8,456