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Leases (Tables) | 12 Months Ended
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Dec. 31, 2020
Leases [Abstract] |
Assets and Lease Liabilities | Operating and financing lease right-of-use assets and lease liabilities as of December 31, 2020 and 2019 were as follows (in thousands):
|  | December 31,
|  | 2020 |  | 2019
Assets: |  |  |  |
Right-of-use assets, operating, net (1) (2) |  | $ | 90,201 |  |  | $ | 86,414 |
Right-of-use assets, financing, net (3) (4) |  | 55,045 |  |  | 9,544 |
Total |  | $ | 145,246 |  |  | $ | 95,958 |
Liabilities: |  |  |  |
Current: |  |  |  |
Operating lease liabilities(5) |  | $ | 5,972 |  |  | $ | 3,583 |
Financing lease liabilities(5) |  | 24,328 |  |  | — |
Total current lease liabilities |  | 30,300 |  |  | 3,583 |
Non-current: |  |  |  |
Operating lease liabilities, non-current |  | 97,421 |  |  | 93,675 |
Financing lease liabilities, non-current |  | 109,874 |  |  | 38,689 |
Total non-current lease liabilities |  | 207,295 |  |  | 132,364 |
Total |  | $ | 237,595 |  |  | $ | 135,947 |
_______ (1) These assets are real estate related assets, which include land, office and laboratory spaces. (2) Net of accumulated depreciation. (3) These assets are real estate assets related to the MTC North and MTC South leases. (4) Included in property and equipment in the consolidated balance sheets, net of accumulated depreciation. (5) Included in other current liabilities in the consolidated balance sheets.
Lease, Cost | The components of the lease costs for the year ended December 31, 2020 and 2019 were as follows (in thousands):
|  | December 31,
|  | 2020 |  | 2019
Operating lease costs |  | $ | 16,939 |  |  | $ | 17,015 |
Financing lease costs: |  |  |  |
Amortization of right-of-use assets, financing leases |  | 1,011 |  |  | 309 |
Interest expense for financing lease liabilities |  | 9,891 |  |  | 6,557 |
Total financing lease costs |  | $ | 10,902 |  |  | $ | 6,866 |
Short term lease costs |  | $ | 13,322 |  |  | $ | — |
Variable lease costs |  | $ | 5,229 |  |  | $ | 4,399 |
Supplemental cash flow information relating to our leases for the year ended December 31, 2020 and 2019 was as follows (in thousands):
|  | December 31,
|  | 2020 |  | 2019
Cash paid for amounts included in measurement of lease liabilities: |  |  |  |
Operating cash flows used in operating leases |  | $ | (15,089) |  |  | $ | (16,121) |
Operating cash flows used in financing leases |  | (8,523) |  |  | (5,585) |
Financing cash flows used in financing leases |  | (7,519) |  |  | — |
Operating lease non-cash items: |  |  |  |
Right-of-use assets reduced through lease modifications and reassessments |  | 6,755 |  |  | 2,717 |
Right-of-use assets obtained in exchange for operating lease liabilities |  | 17,107 |  |  | 34,014 |
Finance lease non-cash items: |  |  |  |
Right-of-use assets obtained through lease modifications and reassessments |  | 46,495 |  |  | — |
Charge to financing lease obligation |  | 1,304 |  |  | 971 |
Weighted average remaining lease terms and discount rates as of December 31, 2020 were as follows:
|  | December 31,
|  | 2020
Remaining lease term: |  |
Operating leases |  | 11 years
Finance leases |  | 25 years
Discount rate: |  |
Operating leases |  | 10.3 | %
Finance leases |  | 13.1 | %
Finance Lease Maturity | Future minimum lease payments under non-cancelable lease agreements as of December 31, 2020, were as follows (in thousands):
Fiscal Year |  | Operating Leases (1) |  | Financing Leases (1) |
2021 |  | $ | 15,492 |  |  | $ | 36,579 |  |
2022 |  | 15,913 |  |  | 11,848 |  |
2023 |  | 16,008 |  |  | 12,054 |  |
2024 |  | 16,168 |  |  | 12,279 |  |
2025 |  | 16,567 |  |  | 12,493 |  |
Thereafter |  | 93,599 |  |  | 428,059 |  |
Total minimum lease payments |  | 173,747 |  |  | 513,312 |  |
Less amounts representing interest or imputed interest |  | (70,354) |  |  | (379,110) |  | (2)
Present value of lease liabilities |  | $ | 103,393 |  |  | $ | 134,202 |  |
______ (1) Include the optional extensions in the MTC North and MTC South lease terms which represent a total of $338.9 million un-discounted future lease payments. (2) MTC South interest is based on an imputed interest rate of 17.2%. MTC North interest is based upon an incremental borrowing rate of 8.2%.
Operating Lease Maturity | Future minimum lease payments under non-cancelable lease agreements as of December 31, 2020, were as follows (in thousands):
Fiscal Year |  | Operating Leases (1) |  | Financing Leases (1) |
2021 |  | $ | 15,492 |  |  | $ | 36,579 |  |
2022 |  | 15,913 |  |  | 11,848 |  |
2023 |  | 16,008 |  |  | 12,054 |  |
2024 |  | 16,168 |  |  | 12,279 |  |
2025 |  | 16,567 |  |  | 12,493 |  |
Thereafter |  | 93,599 |  |  | 428,059 |  |
Total minimum lease payments |  | 173,747 |  |  | 513,312 |  |
Less amounts representing interest or imputed interest |  | (70,354) |  |  | (379,110) |  | (2)
Present value of lease liabilities |  | $ | 103,393 |  |  | $ | 134,202 |  |
______ (1) Include the optional extensions in the MTC North and MTC South lease terms which represent a total of $338.9 million un-discounted future lease payments. (2) MTC South interest is based on an imputed interest rate of 17.2%. MTC North interest is based upon an incremental borrowing rate of 8.2%.

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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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