Class Of Warrant Or Right Weighted Average Exercise Price Of Warrants Or Rights

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- Definition

Investments equity securities.

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No definition available.

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- Definition

Non refundable fees.

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No definition available.

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- Definition

Purchase of stock from related party.

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No definition available.

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- Definition

Warrants exercisable period.

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No definition available.

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- Definition

Warrants expiration year.

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No definition available.

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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- Definition

Number of warrants or rights outstanding.

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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- Definition

Amount of impairment loss on investment in equity security without readily determinable fair value.

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- Definition

For investments which are quantified by principal amount, the principle balance held at close of period.

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- Definition

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

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Investments - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		12 Months Ended
	Mar. 04, 2015	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investments Equity Securities [Abstract]
Purchase of common stock, value				$ 500	$ 0	$ 0
Investment impairment charges				$ (4,678)
Bone Biologics Inc [Member]
Investments Equity Securities [Abstract]
Warrants held for share purchases				13,000
Weighted average exercise price of warrant				$ 14.32
Warrants exercisable period				7 years
Warrant expiration year				2020
Purchase of common stock, value			$ 500
Bone Biologics Inc [Member] \| Common Stock [Member]
Investments Equity Securities [Abstract]
Purchase of stock, shares			25,000
Bone Biologics Inc [Member] \| ASU 2016-01 [Member] \| CommonStock and Warrants [Member]
Investments Equity Securities [Abstract]
Investment impairment charges		$ 4,400
eNeura Note [Member] \| eNeura Inc [Member]
Debt Instrument [Line Items]
Non-refundable fees paid	$ 300
Accrued interest rate on promissory note	8.00%
Maturity description of Promissory note				The eNeura Note will mature on March 4, 2019
Debt Instrument, Maturity Date				Mar. 04, 2019
eNeura Note [Member] \| eNeura Inc [Member] \| Convertible Debt Securities [Member]
Debt Instrument [Line Items]
Principal amount of promissory note	$ 15,000
eNeura Note [Member] \| eNeura Inc [Member] \| Preferred Stock [Member]
Debt Instrument [Line Items]
Conversion price per share				$ 7.30
eNeura Note [Member] \| eNeura Inc [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Third party acquisition				50.00%