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Equity Method Investment (Details) - USD ($) $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Nov. 01, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment |  | $ 4,829 |  | $ 4,892 | [1]
Share of losses from equity method investments |  | 64 | $ 0 |  |
Notch Therapeutics, Inc. |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Payments to acquire interest in Notch | $ 5,100 |  |  |  |
Transaction cost |  | $ 100 |  |  |
Ownership percentage | 25.00% | 25.00% |  |  |
Equity method investment | $ 5,000 |  |  | $ 4,900 |
Share of losses from equity method investments |  | $ 100 |  |  |
[1] | The balance sheet as of December 31, 2019 is derived from the audited financial statements as of that date.

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