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Fair Value Measurements - Schedule of Change in Valuation of Securities (Detail) - Bone Biologics Inc [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Equity securities and warrants beginning balance	$ 219	$ 4,897	$ 219	$ 2,768
Purchase of additional common stock	0	0	0	500
Fair value adjustments, expirations, and impairments recognized in other income (expense), net	0	(229)	0	(229)
Equity securities and warrants ending balance	219	4,668	219	4,668
ASU 2016-01 [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Impact of adoption of ASU 2016-01 recognized in other income (expense), net	$ 0	$ 0	$ 0	$ 1,629

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