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Commitments and Contingencies - Cash flows (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Commitments and Contingencies  
Operating cash flows from operating leases $ 148
Weighted-average remaining lease term - operating leases 4 years 3 months 18 days
Weighted-average discount rate - operating leases 8.97%