Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

Aggregate number of common shares reserved for future issuance.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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- Definition

Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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Description of the reverse stock split arrangement. Also provide the retroactive effect given by the reverse split that occurs after the balance sheet date but before the release of financial statements.

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Stock-Based Compensation Expense - Additional Information (Detail) $ in Thousands		3 Months Ended		9 Months Ended
	May. 04, 2015	Sep. 30, 2015 USD ($) shares	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) shares	Sep. 30, 2014 USD ($)	Jul. 09, 2015 shares	Dec. 31, 2014 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value \| $		$ 3,200		$ 3,200			$ 1,300
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				4 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period				10 years
Stock-based compensation reduction of expense \| $		$ 860	$ (681)	$ 1,474	$ 528
CEO [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation reduction of expense \| $			$ (900)		$ 0
Regado [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reverse stock split				one for nine
Reverse stock split ratio	0.1111
2007 Stock Option Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional grants to be made from plan		0		0
2004 Stock Option Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional grants to be made from plan		0		0
2013 Equity Compensation Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved for future issuance						1,200,000