Commitments (Tables)

12 Months Ended

Dec. 28, 2018

Commitments and Contingencies Disclosure [Abstract]

Balance Sheet Classification of Lease Liabilities

The balance sheet classification of our lease liabilities was as follows (in thousands):



	December 31, 2018		December 31, 2017
Operating lease liabilities:
Current portion included in Other current liabilities	$	2,738	$	540
Long-term portion of lease liabilities	12,099		408
Total operating lease liabilities	14,837		948
Financing lease liabilities:
Financing obligation for build-to-suit lease	—		14,530
Current portion included in Other current liabilities	49		—
Long-term portion of lease liabilities	79		—
Total financing lease liabilities	128		14,530
Total lease liabilities	$	14,965	$	15,478

Components of Lease Expense

The components of lease costs, which were included in Operating expenses in our Consolidated Statements of Operations, were as follows (in thousands):



	Year Ended December 31,
	2018		2017			2016
Operating lease cost	$	4,189	$	3,944		$	8,620
Variable lease cost	1,661		2,216			1,056
Sublease income	—		(1,225		)	(3,553		)
Total lease costs	$	5,850	$	4,935		$	6,123

Maturities of Operating Lease Liabilities

As of December 31, 2018, the maturities of our operating lease liabilities were as follows (in thousands):



	Operating leases
Years ending December 31,
2019	$	2,794
2020	2,823
2021	2,904
2022	3,000
2023	3,082
Thereafter	13,584
Total lease payments	28,187
Less:
Present value adjustment	(5,180		)
Tenant improvement reimbursements	(8,170		)
Operating lease liabilities	$	14,837