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Leases | 12 Months Ended
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Dec. 31, 2020
Leases |
Leases | 6. Leases The Company leases office space in South Plainfield, New Jersey for its principal office under three noncancelable operating leases through May 2022 and August 2024, in addition to office space in various countries for international employees primarily through workspace providers. The Company also leases approximately 220,500 square feet of office, manufacturing and laboratory space at a facility located in Hopewell Township, New Jersey (the “Campus”) pursuant to a Lease Agreement (the “Lease”) with Hopewell Campus Owner LLC (the “Landlord”). The rental term of the Lease commenced on July 1, 2020 and has an initial term of fifteen years (the “Initial Term”), with two consecutive ten year renewal periods, each at the Company’s option. The aggregate rent for the Initial Term will be approximately $111.5 million. The rental rate for the renewal periods will be 95% of the Prevailing Market Rate (as defined in the Lease) and determined at the time of the exercise of the renewal. The Company is also responsible for maintaining certain insurance and the payment of proportional taxes, utilities and common area operating expenses. The Lease contains customary events of default, representations, warranties and covenants. Subject to the terms of the Lease, the Company has a right of first refusal to rent certain other space of the Campus, which would be triggered upon the Landlord’s issuance of a second round proposal or letter of intent to another tenant for such space. The Company also may seek to build a new separate building on the Campus, which may not contain less than 75,000 square feet (the “New Building”). Upon receipt of notice of the Company’s intention to build the New Building, the Landlord may, in its sole discretion, construct and lease the New Building to the Company or enter into a ground lease with the Company permitting the Company to construct the New Building. Rent terms for the New Building would be determined based on the land value, construction and project costs subject to whether the Landlord or Company constructs the New Building. On March 20, 2020, the Company entered into a lease agreement with COE Bridgewater LLC relating to the lease of office and laboratory space located in Bridgewater, New Jersey. This lease replaced the Company’s existing lease on the property beginning on May 1, 2020 and includes additional rental property of approximately 59,000 square feet. On June 19, 2020, the Company entered into a commercial manufacturing service agreement for a term of 12.5 years with MassBiologics of the University of Massachusetts Medical School ("MassBio"). The agreement will expire on December 31, 2032 unless the Company terminates it on 24 months prior written notice to MassBio. Pursuant to the terms of the agreement, MassBio agreed to provide the Company with four dedicated rooms for its gene therapy AADC program. The Company concluded that the agreement contains an embedded lease as the Company controls the use of the four dedicated rooms and the equipment therein. As the present value of the facilities exceeds the assessed fair value, the Company determined that it is a finance lease. Given that the embedded finance lease is designed for the production of PTC’s AADC program and would not have an alternate use outside the PTC gene therapy platform without incurring significant costs, the Company determined that the lease should be treated as research and development expense under ASC 730. Accordingly, the Company expensed the present value of all guaranteed future cash payments of $41.4 million during the year ending December 31, 2020. Additionally, during the year ending December 31, 2020, the Company recorded finance lease costs of $0.9 million related to interest on the lease liability. The Company also leases certain vehicles, lab equipment, and office equipment under operating leases. The Company’s operating leases have remaining lease terms ranging from 0.1 years to 14.5 years and certain leases include renewal options to extend the lease for up to 10 years. Rent expense was approximately $15.3 million, $6.0 million, and $2.7 million for the years ended December 31, 2020, 2019, and 2018. The components of lease expense were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, 2020 | ​ | Year Ended December 31, 2019
Operating Lease Cost | ​ | ​ | ​ | ​ | ​ |
Fixed lease cost | ​ | $ | 12,368 | ​ | $ | 4,929
Variable lease cost | ​ | ​ | 2,448 | ​ | ​ | 694
Short-term lease cost | ​ | ​ | 450 | ​ | ​ | 350
Total operating lease cost | ​ | $ | 15,266 | ​ | $ | 5,973
​ Total operating lease cost is a component of operating expenses on the consolidated statements of operations. Supplemental balance sheet information related to leases was as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020 | ​ | December 31, 2019
Operating lease ROU asset | ​ | $ | 84,410 | ​ | $ | 13,693
​ | ​ | ​ | ​ | ​ | ​ | ​
Operating lease liabilities- current | ​ | $ | 7,465 | ​ | $ | 5,153
Operating lease liabilities- noncurrent | ​ |  | 79,499 | ​ | ​ | 9,018
Total operating lease liability | ​ | $ | 86,964 | ​ | $ | 14,171
​ ​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020 |  | December 31, 2019
Finance lease liabilities- current | ​ | $ | 1,276 | ​ | $ | —
Finance lease liabilities- noncurrent | ​ |  | 23,053 | ​ |  | —
Total finance lease liability | ​ | $ | 24,329 | ​ | $ | —
​ The Company’s leases in Bridgewater, New Jersey and Hopewell Township, New Jersey are the primary drivers of the increase in total operating lease ROU asset and total operating lease liability from December 31, 2019 to December 31, 2020. ​ Supplemental lease term and discount rate information related to leases was as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2020 |  | ​ | December 31, 2019 |
Weighted-average remaining lease terms - operating leases (years) |  | 11.49 | ​ | ​ | 3.38 | ​
Weighted-average discount rate - operating leases | ​ | 8.86 | % | ​ | 7.33 | %
Weighted-average remaining lease terms - finance lease (years) |  | 12.00 | ​ | ​ | — | ​
Weighted-average discount rate - finance lease |  | 7.80 | % | ​ | — | %
​ Supplemental cash flow information related to leases was as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2020 |  | 2019
Cash paid for amounts included in the measurement of lease liabilities: | ​ | ​ |  | ​ | ​ |
Operating cash flows from operating leases | ​ | $ | 8,462 | ​ | $ | 4,466
Financing cash flows from finance lease | ​ | ​ | 17,829 | ​ | ​ | —
Operating cash flows from finance leases | ​ | ​ | 171 | ​ | ​ | —
​ | ​ | ​ | ​ | ​ | ​ | ​
Right-of-use assets obtained in exchange for lease obligations: | ​ |  |  | ​ |  |
Operating leases | ​ | $ | 76,811 | ​ | $ | 17,389
Finance lease | ​ | ​ | 41,382 | ​ | ​ | —
​ Future minimum lease payments under non-cancelable leases as of December 31, 2020 were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Operating Leases |  | Finance Lease
2021 | ​ | $ | 13,721 | ​ | $ | 3,000
2022 | ​ |  | 13,301 | ​ |  | 3,000
2023 | ​ |  | 12,870 | ​ |  | 3,000
2024 | ​ |  | 12,171 | ​ |  | 3,000
2025 and thereafter | ​ |  | 92,012 | ​ |  | 24,000
Total lease payments | ​ |  | 144,075 | ​ |  | 36,000
Less: Imputed Interest expense | ​ |  | 57,111 | ​ |  | 11,671
Total | ​ | $ | 86,964 | ​ | $ | 24,329
​ In conjunction with the Asset Acquisition, the Company acquired BioElectron’s lease in Mountain View, California. As substantially all of the fair value of the gross assets acquired was related to vatiquinone, the relative fair value allocated to the right of use asset and corresponding lease liability for the Mountain View lease was determined to be immaterial, and accordingly is not included in the tables above. The future minimum lease payments for the Mountain View lease are $1.8 million and $1.4 million for 2021 and 2022, respectively, and $0 thereafter.

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