Accruals and Other Liabilities - Schedule of Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Other Liabilities Disclosure [Abstract]
Employee related liabilities	$ 4,787	$ 3,037
Customer down payments	1,018	421
Liabilities for environmental tax	4,824	2,214
Liabilities for withholding tax	1,417	1,941
Liabilities for VAT	555	1,915
Liabilities for outstanding invoices	5,902	8,637
Liabilities for leases	7,598
Other current liabilities	6,407	12,328
Total	$ 32,509	$ 30,493