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Leases​ (Tables)
 9 Months Ended
Sep. 30, 2021
Leases [Abstract]  
Schedule of Operating Lease Maturity
Future minimum contractual operating lease obligations were as follows:
September 30, 2021December 31, 2020
2021$11 $43 
202238 34 
202330 26 
202422 20 
202517 16 
Thereafter40 41 
Total lease payments$158 $180 
Less: imputed interest25 33 
Present value of lease liabilities$133 $147