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Leases - Schedule of Operating Lease Right-of-use Assets and Liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jan. 02, 2019
Mar. 31, 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
Less amortization of operating lease right-of-use assets   (72)
Operating lease right-of-use assets at March 31, 2019   2,264
Initial measurement at January 1, 2019   3,458
Less principal payments on operating lease liabilities   (28)
Operating lease liabilities at March 31, 2019   3,430
Less non-current portion   (3,186)
Current portion at March 31, 2019   $ 244