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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Contractual Commitments under Non-cancelable Agreements
Future minimum contractual commitments as of December 31, 2020 under non-cancelable agreements having initial or remaining terms in excess of one year are as follows: 
 20212022202320242025Thereafter
Gas contract$680 $— $— $— $— $— 
Office leases791 696 595 605 152 — 
Automobile leases75 5 — — — — 
Total$1,546 $701 $595 $605 $152 $—