Leases - Schedule of Lease Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets and Liabilities, Lessee
Operating lease assets	$ 841	$ 965
Finance lease assets	$ 8,717	9,302
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Total lease assets	$ 9,558	10,267
Operating lease liabilities current	315	364
Finance lease liabilities current	2,394	3,440
Operating lease liabilities non-current	594	650
Finance lease liabilities non-current	0	648
Total lease liabilities	$ 3,303	$ 5,102