Leases - Balance Sheet Location (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Operating leases
Operating lease right of use assets	$ 17,665	$ 13,274
Operating lease liability, current	3,028	3,006
Operating lease liability, noncurrent	14,637	10,268
Total operating lease liabilities	17,665	13,274
Finance leases
Property, plant, and equipment	3,540	3,518
Accumulated amortization	(3,231)	(2,943)
Property, plant, and equipment - net	309	575
Finance lease liability, current	141	405
Finance lease liability, noncurrent	168	170
Total finance lease liabilities	$ 309	$ 575
Operating lease, liability, current, statement of financial position [extensible list]	us-gaap:AccruedLiabilitiesCurrent
Finance lease, right-of-use asset, statement of financial position [extensible list]	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Finance lease, liability, current, statement of financial position [extensible list]	us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
Finance lease, liability, noncurrent, statement of financial position [extensible list]	us-gaap:LongTermDebtAndCapitalLeaseObligations