Leases (Tables)

9 Months Ended

Sep. 28, 2018

Balance Sheet Classification of Lease Liabilities

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



	September 30, 2018		December 31, 2017
Operating lease liabilities:
Current portion included in Other current liabilities	$	2,315	$	—
Long-term portion of lease liabilities	12,529		—
Total operating lease liabilities	14,844		—
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	90		—
Total financing lease liabilities	139		14,530
Total lease liabilities	$	14,983	$	14,530

Components of Lease Expense

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



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Operating lease cost	$	1,614	$	986	$	3,587	$	4,292
Variable lease cost	363		229		1,366		705
Sublease income	—		—		—		(1,225		)
Total lease costs	$	1,977	$	1,215	$	4,953	$	3,772

Maturities of Operating Lease Liabilities

As of September 30, 2018, the maturities of our operating lease liabilities were as follows (in thousands):



	Operating leases
Remainder of 2018	$	403
Years ending December 31,
2019	2,654
2020	2,823
2021	2,904
2022	3,000
Thereafter	16,665
Total lease payments	28,449
Less:
Imputed interest	(5,435		)
Tenant improvement reimbursements	(8,170		)
Operating lease liabilities	$	14,844