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Related Party Transactions (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Related Party Transaction [Line Items]    
Repurchase of preferred stock (in shares)   1,202,196
Repurchase of preferred stock   $ 425
Former employee | Series B Preferred Stock    
Related Party Transaction [Line Items]    
Repurchase of preferred stock (in shares) 1,202,196  
Purchase price, contractual right of first refusal $ 2,500  
Share price (in dollars per share) $ 1.73  
Repurchase of preferred stock $ 425