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Leases - Maturities of Operating Lease Liabilities (Details) - USD ($) $ in Thousands	Sep. 27, 2019	Dec. 28, 2018
Maturities of Operating Lease Liabilities
Remainder of 2019	$ 745
Years ending December 31,
2020	3,625
2021	3,731
2022	3,852
2023	3,959
Thereafter	17,444
Total lease payments	33,356
Less:
Present value adjustment	(5,258)
Tenant improvement reimbursements	(1,742)
Operating lease liabilities	$ 26,356	$ 14,837

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Amount of lessee's undiscounted obligation for lease payments for operating lease.

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