Quarterly report pursuant to Section 13 or 15(d)

Net Income (Loss) Per Share - Summary of Potentially Dilutive Securities (Details)

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Net Income (Loss) Per Share - Summary of Potentially Dilutive Securities (Details) - shares
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]        
Potentially dilutive securities not included in the calculation of diluted net loss per share 295,546 426,280 938,290 427,645
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 244,543 375,277 887,287 427,645
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 51,003 51,003