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Marketable Securities and Fair Value Measurements - Fair Value of the Company's Derivative Liability (Details)
9 Months Ended
Sep. 30, 2019
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance $ 0
Initial fair value upon issuance of the Bonds 7,055,371,000
Change in fair value (2,551,453,000)
Ending balance $ 4,503,918,000