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Income Taxes (Detail) - Component of Income tax Reconciliation (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Expected tax benefit $ (3,421) $ (2,356)
Net tax effects of:    
Foreign tax rate differential 408 89
State taxes, net of federal benefit (529) (864)
Return to provision adjustment 832 30
Research and other credits (2) (191)
Permanent difference on convertible notes and warrants (31) (374)
Permanent difference on deemed dividend    78
Other 73 (456)
Change in deferred tax asset valuation allowance 2,303 4,335
Income taxes attributable to loss from continuing operations $ (367) $ 291