Deposits - Summary of Long-term Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Long Term Deposits [Line Items]
Long term deposits	$ 4,305	$ 6,347
Deposits on Equipment
Long Term Deposits [Line Items]
Long term deposits	1,156	3,505
Deposits on Construction
Long Term Deposits [Line Items]
Long term deposits		1,500
Other Long-term Deposits
Long Term Deposits [Line Items]
Long term deposits	$ 3,149	$ 1,342