XML 110 R119.htm IDEA: XBRL DOCUMENT

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax [Line Items]
Tax computed at statutory rate	35.00%	35.00%	35.00%
Federal tax credit carryforwards	$ 35,605,000	$ 25,465,000
Federal [Member]
Income Tax [Line Items]
Tax credit carry forwards, Expiration dates	Begin expiring in 2017
From 2008 through 2010 tax years [Member] \| Federal [Member]
Income Tax [Line Items]
Federal tax credit carryforwards	36,000,000
2002 through 2012 tax years [Member] \| State [Member]
Income Tax [Line Items]
Federal and state net operating loss carryforwards	$ 42,000,000
Operating loss carry forwards, Expiration dates	Begin expiring in 2028

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

+ References+ Details

- Definition

The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.

+ References+ Details

- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

+ References+ Details