Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Warrants - Summary of Derivative Warrant Activity (Details)

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Fair Value of Warrants - Summary of Derivative Warrant Activity (Details) - 2016 Offerings
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
Class of Warrants Outstanding [Roll Forward]  
Fair value of warrants outstanding as of December 31, 2019 $ 178
Change in fair value of warrants (152)
Fair value of warrants outstanding as of June 30, 2020 $ 26