Annual report pursuant to Section 13 and 15(d)

Net Loss per Share - Schedule of Anti-dilutive Shares Outstanding Excluded in Calculation of Diluted Net Loss per Share (Details)

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Net Loss per Share - Schedule of Anti-dilutive Shares Outstanding Excluded in Calculation of Diluted Net Loss per Share (Details) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Total 1,094,663 1,809,718 6,499,921
Options to Purchase Common Stock      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Total 820,186 1,294,128 1,130,141
Unvested Restricted Stock Units      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Total 110,764 47,312  
The March 2017 Preferred stock warrant or common stock      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Total 163,713 468,278 680,027
Series B-1 Convertible Preferred Stock (as-converted)      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Total     3,848,023
Series A-2 Convertible Preferred Stock (as-converted)      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Total     841,730