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Leases - Schedule of Operating Lease Right-of-use Assets and Liabilities (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jan. 02, 2019
Jun. 30, 2019
Leases [Abstract]    
Initial measurement at January 1, 2019 $ 3,458  
Less tenant improvement allowance (1,122)  
Net right-of-use assets at January 1, 2019   $ 2,336
Initial measurement of new operating lease right-of-use-assets   53
Less amortization of operating lease right-of-use assets   (144)
Operating lease right-of-use assets at June 30, 2019   2,245
Initial measurement at January 1, 2019 3,458  
Initial measurement of new operating lease liabilities 53  
Less principal payments on operating lease liabilities $ (58) (28)
Operating lease liabilities at June 30, 2019   3,453
Less non-current portion   (3,090)
Current portion at June 30, 2019   $ 363