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Net Income (Loss) Per Share - Summary of Potentially Dilutive Securities (Details) - shares
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Potentially dilutive securities not included in the calculation of diluted net loss per share 1,210,065 6,581
Employee Stock Options    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Potentially dilutive securities not included in the calculation of diluted net loss per share 1,159,062 6,581
Warrants outstanding    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Potentially dilutive securities not included in the calculation of diluted net loss per share 51,003