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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2020
Commitments And Contingencies Disclosure [Abstract] |
Summary of Operating Lease Expense | Our lease expense comprises of the following (in thousands):
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Operating lease expense |  | $ | 6,267 |  |  | $ | 6,886 |  |  | $ | 3,953 |
Summary of Balance Sheet Classification of Operating Lease Liabilities | The balance sheet classification of our operating lease liabilities was as follows (in thousands):
|  | December 31, 2020 |  |  | December 31, 2019 |
Operating lease liabilities: |  |  |  |  |  |  |  |
Current portion of lease liabilities (included in other current liabilities) |  | $ | 3,247 |  |  | $ | 3,039 |
Long-term portion of lease liabilities |  |  | 34,789 |  |  |  | 37,845 |
Total operating lease liabilities |  | $ | 38,036 |  |  | $ | 40,884 |
Summary of Maturities of Sublease Income and Operating Lease Liabilities | At December 31, 2020, the maturities of our sublease income and operating lease liabilities were as follows (in thousands):
Years ending December 31, |  | Sublease Income |  |  | Operating Lease Liabilities |
2021 |  | $ | 5,201 |  |  | $ | 6,942 |
2022 |  |  | 5,357 |  |  |  | 6,268 |
2023 |  |  | 5,518 |  |  |  | 5,403 |
2024 |  |  | 5,684 |  |  |  | 5,547 |
2025 |  |  | 5,854 |  |  |  | 5,696 |
Thereafter |  |  | 33,742 |  |  |  | 30,760 |
Total |  | $ | 61,356 |  |  |  | 60,616 |
Less: |  |  |  |  |  |  |  |
Present value adjustment |  |  |  |  |  |  | (22,580 | )
Total |  |  |  |  |  | $ | 38,036 |
Summary of Weighted Average Remaining Lease Term and Weighted Average Discount Rate | The weighted average remaining lease term and the weighted average discount rate used to determine the operating lease liability were as follows:
|  | December 31, 2020 |  |  | December 31, 2019 |
Weighted average remaining lease term |  | 9.1 years |  |  | 9.7 years |
Weighted average discount rate |  |  | 10.1 | % |  |  | 10.1 | %

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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=121609121&loc=SL77918686-209980 + Details
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