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Proceeds Investment Agreement Obligation - Schedule of Proceeds Investment Agreement Activity (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Proceeds Investment Agreement Obligation        
Beginning balance as of December 31, 2019      
Repayment of obligation      
Change in the fair value during the period $ (2,578,000) $ 2,961,000 (2,885,000) $ 3,098,000
Ending balance as of June 30, 2020 $ 3,615,000   $ 3,615,000