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Leases - Schedule of Operating Lease Right-of-use Assets and Liabilities (Details) - USD ($)
$ in Thousands
 9 Months Ended
Jan. 02, 2019
Sep. 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 $ 2,336
Initial measurement of new operating lease right-of-use-assets   57
Less amortization of operating lease right-of-use assets   (217)
Operating lease right-of-use assets at September 30, 2019 $ 2,336 2,176
Initial measurement at January 1, 2019   3,458
Initial measurement of new operating lease liabilities   57
Less principal payments on operating lease liabilities   (111)
Operating lease liabilities at September 30, 2019   3,404
Less non-current portion   (2,992)
Current portion at September 30, 2019   $ 412