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Commitments and Contingencies (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Commitments and contingencies.    
Estimated Litigation Liability $ 6,400,000  
Litigation Settlement, Expense $ 300,000  
Interest Rate Description Litigation plus legal interest that accrued at 12% per annum from August 13, 2008 to June 30, 2013, and thereafter accrued and continues to accrue at 6% per annum  
Operating Leases, Rent Expense $ 2,110,000 $ 2,568,000