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Commitments and Contingencies (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Aug. 31, 2018
ft²
Dec. 31, 2018
USD ($)
ft²
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Commitments and Contingencies        
Approximate operating lease rental space | ft² 13,600 6,800    
Lease term 6 years      
Lease renewal term 5 years      
Rent expense   $ 359 $ 215 $ 179
Future minimum payments under the operating lease agreements        
2019   425    
2020   786    
2021   802    
2022   818    
2023   834    
Thereafter   1,353    
Total   $ 5,018