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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
	Mar. 31, 2019	Mar. 31, 2018
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Equity securities and warrants beginning balance	$ 219	$ 2,768
Purchase of additional common stock	0	500
Equity securities and warrants ending balance	219	4,897
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, net	$ 0	$ 1,629

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The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

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