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Summary of Significant Accounting Policies (Narrative) (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) item | Mar. 31, 2019 | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) item | Feb. 29, 2020 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Fair value of the financing derivative |  | $ 0 |  |  | $ 0 |
Financing derivative |  |  |  |  |  | $ 0
Proceeds from Continuation Advances | 34,000,000 | $ 18,000,000.0 |  | 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-controll 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 |  |
Gain from Continuation Advances | 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 | 11.00% |  |  |  |  |
Sales Revenue, Net [Member] | Gene Company Limited [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Concentration risk, percentage |  |  | 17.00% |  |  |

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