Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Leases
Operating lease ROU assets	$ 17,493	$ 23,457
Financial position	us-gaap:OtherAssetsNoncurrent	us-gaap:OtherAssetsNoncurrent
Operating lease liabilities - current	$ 8,373	$ 10,479
Financial position	us-gaap:OtherLiabilitiesCurrent	us-gaap:OtherLiabilitiesCurrent
Operating lease liabilities - noncurrent	$ 10,843	$ 14,694
Financial position	us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent
Total Operating lease liabilities	$ 19,216	$ 25,173
Financing Lease ROU assets	$ 140	$ 248
Financial position	Property, Plant and Equipment, Net	Property, Plant and Equipment, Net
Finance lease liabilities - current	$ 112	$ 203
Financial position	us-gaap:OtherLiabilitiesCurrent	us-gaap:OtherLiabilitiesCurrent
Finance lease liabilities - noncurrent	$ 19	$ 55
Financial position	us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent
Finance lease liabilities	$ 131	$ 258
Weighted average remaining lease term - Operating leases	4 years	4 years
Weighted average remaining lease term - Financing leases	1 year	1 year
Weighted average discount rate - Operating leases	4.28%	4.32%
Weighted average discount rate - Financing leases	6.00%	6.00%
Finance lease assets
Leases
Property and equipment, gross	$ 801	$ 985
Accumulated depreciation	$ (661)	$ (737)