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Summarized Activity of Level 3 Inputs Measured on Recurring Basis (Detail) (Warrant Liability, USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Warrant Liability
Summary Of Significant Accounting Policies [Line Items]
Balance at December 31, 2011	$ 368
Change in fair value of Warrant liability
Balance at June 30, 2012	$ 368

Amount of increase (decrease) of liabilities measured at fair value on a recurring basis using unobservable inputs (level 3) which have taken place during the period. Such increase (decrease) may be comprised of changes in fair value (gains or losses) whether realized or unrealized that have been included in earnings, changed net asset value, or other comprehensive income (a separate component of shareholders' equity); purchases, sales, issues, or settlements of assets; and net transfers in to or out of this category within the fair value hierarchy.

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