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Income Taxes - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Tax benefit recognized $ 0us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance $ 0us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance  
Valuation allowance, deferred tax assets 25,776,000us-gaap_DeferredTaxAssetsValuationAllowance    
Deferred tax assets valuation allowance increase     10,241,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Amount generated in cash refund $ 1,600,000us-gaap_IncomeTaxReceivable