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v3.20.2

Related Party Transactions - Additional Information (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Shares issued as payment for services |  |  |  | $ 4,857 |  | $ 5,688 |
Proceeds from sales of equity securities |  |  |  |  | $ 0 | 589 |
Other receivables |  | $ 4,978 | $ 364 |  | 364 |  | $ 4,978
Third Security, LLC |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Expense for services |  |  | 38 | $ 1 | 76 | $ 18 |
Common stock calculation period |  |  |  |  |  |  | 30 days
Shares issued as payment for services (in shares) |  |  |  | 483,279 |  | 839,993 |
Shares issued as payment for services |  |  |  | $ 2,284 |  | $ 4,362 |
Sublease rental income |  |  | $ 24 | $ 22 | $ 46 | $ 44 |
Third Security, LLC | Common Stock |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Expense for services |  |  |  |  |  |  | $ 800
Fibrocell Science, Inc. |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Proceeds from sales of equity securities |  | 1,280 |  |  |  |  |
Proceeds from convertible notes receivable and investment in preferred stock | $ 3,311 |  |  |  |  |  |
Other receivables |  | $ 3,311 |  |  |  |  | $ 3,311
Third Security, LLC | Executive Chairman |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Ownership interest |  |  | 100.00% |  | 100.00% |  |

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