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Commitments and contingencies (Tables)
12 Months Ended
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Commitment on the Remaining Operating Lease
Future minimum lease payments under non-cancellable leases as of December 31, 2019 were as follows:

Maturity of lease liabilities
2020$360
2021$370
2022$219
Total lease payments$949
         Less: Interest$(128)
Present value of lease liabilities$821