Annual report pursuant to Section 13 and 15(d)

Leases (Details)

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Leases (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Lessee, Lease, Description [Line Items]      
Net gain on extinguishment of lease liabilities $ (10,100,000)    
Operating Leases, Future Sublease Income, Remainder of Fiscal Year 644,000    
Operating Leases, Future Sublease Income, Due in Two Years 546,000    
Operating Leases, Future Sublease Income, Due in Three Years 488,000    
Operating Leases, Future Sublease Income, Due in Four Years 291,000    
Operating Leases, Future Minimum Payments, Remainder of Fiscal Year 5,406,000    
Operating Leases, Future Minimum Payments, Due in Two Years 5,217,000    
Operating Leases, Future Minimum Payments, Due in Three Years 3,591,000    
Operating Leases, Future Minimum Payments, Due in Four Years 1,030,000    
Operating Leases, Future Minimum Payments Due 15,244,000    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 1,096,000    
Unrealized gain/loss on translation to reporting currency (3,000)    
Operating Lease, Liability 14,145,000    
Operating Lease, Liability, Current $ 4,810,000 $ 1,214,000  
Lessee, Operating Lease, Renewal Term 5 years    
Operating Lease, Weighted Average Discount Rate, Percent 5.00%    
Operating Lease, Weighted Average Remaining Lease Term 2 years 10 months 24 days    
Operating Lease, Cost $ 3,100,000 4,500,000 $ 4,200,000
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 500,000    
Operating Leases, Rent Expense, Sublease Rentals 1,200,000 2,400,000 $ 2,100,000
Operating Lease, Liability, Noncurrent 9,335,000 $ 4,097,000  
Operating Leases, Future Sublease Income Due $ 1,969,000    
Minimum [Member]      
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Term of Contract 3 years    
Maximum [Member]      
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Term of Contract 5 years