Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Details)

v2.4.1.9
Income Taxes - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Contingency [Line Items]      
Provision (benefit) for income taxes $ 3,226us-gaap_IncomeTaxExpenseBenefit $ (21,587)us-gaap_IncomeTaxExpenseBenefit $ 18us-gaap_IncomeTaxExpenseBenefit
Valuation allowance 2,899us-gaap_DeferredTaxAssetsValuationAllowance 4,122us-gaap_DeferredTaxAssetsValuationAllowance  
Plus (less): change in valuation allowance 1,223us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 22,909us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount (614)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Change in ownership description In general, an “ownership change” occurs if there is a cumulative change in ownership by “5% shareholders” that exceeds 50 percentage points over a rolling three-year period.    
Change in ownership percentage 5.00%us-gaap_EquityMethodInvestmentOwnershipPercentage    
Unrecognized tax benefits 577us-gaap_UnrecognizedTaxBenefits 306us-gaap_UnrecognizedTaxBenefits  
Unrecognized tax benefits, interest or penalties recognized 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense  
Projections related unrecognized tax benefits for next year We do not expect a material increase or decrease in unrecognized tax benefits over the next 12 months.    
California      
Income Tax Contingency [Line Items]      
Net operating loss carryforwards 32,796us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_CaliforniaFranchiseTaxBoardMember 		   
Valuation allowance 2,899us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_CaliforniaFranchiseTaxBoardMember 		   
Plus (less): change in valuation allowance 1,223us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_CaliforniaFranchiseTaxBoardMember 		   
Federal      
Income Tax Contingency [Line Items]      
Net operating loss carryforwards 59,319us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember 		57,463us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember 		 
Net operating loss carryforwards expiration, beginning year 2023 2023  
State      
Income Tax Contingency [Line Items]      
Net operating loss carryforwards $ 46,434us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember 		$ 52,769us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember 		 
Net operating loss carryforwards expiration, beginning year 2015 2015