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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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