Leases - Lease Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Operating leases:
Other long-term assets, net	$ 928	$ 1,033
Accrued liabilities	571	475
Other long-term liabilities	937	1,250
Total operating lease liabilities	1,508	1,725
Finance leases:
Property, plant and equipment	14,549	14,375
Accumulated depreciation	(851)	(1,425)
Property, plant and equipment, net	13,698	12,950
Current portion of long-term debt	3,141	3,685
Long-term debt	6,343	7,472
Total finance lease liabilities	$ 9,484	$ 11,157
Weighted-average remaining lease term
Operating leases	2 years 9 months 18 days	3 years 7 months 6 days
Finance leases	2 years 2 months 12 days	2 years 8 months 12 days
Weighted-average discount rate
Operating leases	8.14%	8.07%
Finance leases	9.02%	7.64%
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsNoncurrent	us-gaap:OtherAssetsNoncurrent
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtAndCapitalLeaseObligations	us-gaap:LongTermDebtAndCapitalLeaseObligations
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent	us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent	us-gaap:AccruedLiabilitiesCurrent
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent