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Summary of Significant Accounting Policies (Narrative) (Details)	3 Months Ended				6 Months Ended			12 Months Ended
	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) item	Jun. 30, 2019	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2019	Dec. 31, 2019 USD ($) item	Feb. 29, 2020 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Fair value of the financing derivative			$ 0					$ 0
Financing derivative									$ 0
Continuation Advances		$ 34,000,000.0	$ 18,000,000.0		34,000,000	$ 52,000,000.0
Deferred gain from Reverse Termination Fee	98,000,000				$ 98,000,000
Period in which company must repay continuation advances if change-of-control transaction is entered into with third party					2 years
Equity or debt financing that must be raised in a single transaction					$ 100,000,000
Period in which company must raise equity or debt financing in a single transaction					2 years
Contingent repayment liability	$ 0	0			$ 0	$ 0
Gain from Continuation Advances		$ 34,000,000.0			34,000,000			$ 18,000,000.0
Fair value assets/liabilities transfer between levels					$ 0
Measurement Input, Discount Rate [Member]
Summary Of Significant Accounting Policies [Line Items]
Derivative liability, measurement input | item			0.065					0.065
Sales Revenue, Net [Member] | TOMY Digital Biology Co. [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	15.00%			23.00%	11.00%		20.00%

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