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Fair Value Measurements Marketable Securities and Fair Value Measurements - Fair Value of the Company's Derivative Liability (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance at beginning of year $ 0
Initial fair value upon issuance of the Bonds 7,055,371
Change in fair value 1,763,652
Balance at end of year $ 8,819,000