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Basis of Presentation and Summary of Significant Accounting Policies - Rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Accounting Policies [Abstract]      
Issuance of warrants January 2020 $ 1,636    
Warrant liabilities 763   $ 0
Change in fair value of warrant liabilities $ (873) $ 0