Accrued Liabilities - Schedule of Current Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Accrued liabilities, current
Loss on purchase commitments (Note 13)	$ 9,383	$ 9,402
Severance costs	3,419	3,558
Payroll and benefits	994	1,789
Contingent liability for earn-out provision	1,115	1,416
Taxes other than income taxes	633	544
Due to third parties	504	434
Legal costs	721	333
Deferred revenue, current	152	146
Other	300	653
Total current accrued liabilities	$ 17,221	$ 18,275