Quarterly report pursuant to Section 13 or 15(d)

Operating Leases (Details)

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Operating Leases (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Jan. 01, 2019
Lessee, Lease, Description [Line Items]    
Extension renewal term 5 years  
Lease termination period 1 year  
Operating lease right-of-use assets (Note 5) $ 19,662 $ 21,000
Operating lease liabilities - current 8,131  
Operating lease liabilities - noncurrent 10,971 $ 21,000
Total operating lease liabilities 19,102  
Cash paid for amounts included in the measurement of operating lease liabilities 2,498  
Operating lease right-of-use assets obtained in exchange for lease obligations $ 60  
Weighted average remaining lease term (in years) 3 years  
Weighted average discount rate 7.00%  
Minimum    
Lessee, Lease, Description [Line Items]    
Operating lease term 1 year  
Maximum    
Lessee, Lease, Description [Line Items]    
Operating lease term 6 years