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Joint Venture - Additional Information (Details) - USD ($) $ in Thousands | Jul. 05, 2019 | Sep. 30, 2021 | Dec. 31, 2020 | Jan. 03, 2019
--- | --- | --- | --- | ---
Subsidiary or Equity Method Investee [Line Items] |  |  |  |
Common stock, shares issued |  | 216,145,804 | 214,591,906 |
Eden Bio Cell [Member] |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |
Equity method investments |  | $ 0 |  |
TriArm [Member] | Eden Bio Cell [Member] |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |
Equity interest in affilated entity | 50.00% |  |  |
TriArm [Member] | License Agreement Terms [Member] | Eden Bio Cell [Member] |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |
Milestone payment made | $ 10,000 |  |  |
Share Subscription Agreement [Member] | Ziopharm [Member] | Eden Bio Cell [Member] |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |
Common stock, shares issued |  |  |  | 10,000,000
Share Subscription Agreement [Member] | TriArm [Member] | Eden Bio Cell [Member] |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |
Common stock, shares issued |  |  |  | 10,000,000

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