Derivative Instruments - Additional Information (Detail) Share data in Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2014 Bone Biologics Inc [Member] USD ($)	Dec. 31, 2014 Swap Agreement [Member] USD ($)	Sep. 30, 2010 Cross-currency swap [Member] Designated as Hedging Instrument [Member] Pay Euros [Member] EUR (€)	Sep. 30, 2010 Cross-currency swap [Member] Designated as Hedging Instrument [Member] Receive U.S. dollars [Member] USD ($)
Derivatives Fair Value [Line Items]
Notional amount						€ 28,700,000	$ 35,000,000
Fixed rate (as a percent)						5.00%	4.635%
Swap agreement expiration date					Dec. 30, 2016
Unrealized (loss) gain on derivative instrument	(307,000)	443,000	(416,000)		300,000
Purchase of notes receivable				$ 750,000
Warrants held for share purchases				125
Exercise price of warrant				$ 1.00
Warrants exercisable period				7 years