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Commitments (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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