Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Schedule of Antidilutive Securities (Details)

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Summary of Significant Accounting Policies - Schedule of Antidilutive Securities (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]      
Antidilutive securities (shares) 3,191,108 4,219,798 1,792,607
Stock options      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities (shares) 822,269 1,864,292 1,607,347
Restricted stock units      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities (shares) 13,333 0 185,260
Warrants      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities (shares) 2,355,506 2,355,506 0