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11. Commitments and contingencies (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]                
Litigation Settlement, Amount $ 3,600,000us-gaap_LitigationSettlementAmount              
Loss Contingency, Settlement Agreement, Terms $25,000              
Loss Contingency, Loss in Period 3,625,000us-gaap_LossContingencyLossInPeriod              
Operating Leases, Rent Expense 918,000us-gaap_LeaseAndRentalExpense 918,000us-gaap_LeaseAndRentalExpense 1,005,000us-gaap_LeaseAndRentalExpense          
Operating Leases, Future Minimum Payments, Remainder of Fiscal Year               850,000us-gaap_OperatingLeasesFutureMinimumPaymentsRemainderOfFiscalYear
Operating Leases, Future Minimum Payments, Due in Two Years             584,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears  
Operating Leases, Future Minimum Payments, Due in Three Years           86,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
Operating Leases, Future Minimum Payments, Due in Four Years         4,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears      
Operating Leases, Future Minimum Payments, Due in Five Years       $ 1,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears