Annual report pursuant to Section 13 and 15(d)

Significant Accounting Policies - Summary of Potentially Dilutive Securities (Details)

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Significant Accounting Policies - Summary of Potentially Dilutive Securities (Details) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 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 402 1,029 514
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 402 978 514
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