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Collaboration and Licensing Revenue - Fibrocell Science Collaboration (Details) - Fibrocell Science, Inc. - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
	Apr. 30, 2019	Sep. 30, 2019
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Collaboration agreement, percentage of sublicensing income	50.00%
Collaboration and licensing agreements
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Collaborative arrangement consideration received, cash		$ 3,750

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Collaborative Arrangement Consideration Received Cash

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License Agreement, Percentage of Sublicensing Income

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