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Significant Accounting Policies - Summary of Outstanding Securities Excluded from Computation of Diluted Weighted Shares Outstanding (Details) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings per Share [Line Items]    
Anti-dilutive securities excluded from calculation of diluted loss per share 7,313,317 4,830,493
Options Outstanding    
Antidilutive Securities Excluded from Computation of Earnings per Share [Line Items]    
Anti-dilutive securities excluded from calculation of diluted loss per share 3,308,049 2,448,646
RSUs    
Antidilutive Securities Excluded from Computation of Earnings per Share [Line Items]    
Anti-dilutive securities excluded from calculation of diluted loss per share 964 1,928
Warrants Outstanding    
Antidilutive Securities Excluded from Computation of Earnings per Share [Line Items]    
Anti-dilutive securities excluded from calculation of diluted loss per share 4,004,304 2,379,919