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Leases (Tables) | 12 Months Ended
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Dec. 31, 2018
Leases [Abstract] |
Schedule of current significant leased properties | The following table contains information about our current significant leased properties as of December 31, 2018:
Location | Approximate Square Feet |  | Use |  | Lease expiry date
Cranbury, New Jersey | 90,000 |  |  | Office and laboratory |  | September 2025
United Kingdom | 46,617 |  |  | Office |  | August 2028
Princeton, New Jersey | 21,922 |  |  | Office |  | January 2022
Schedule of aggregate annual future minimum lease payments under the operating leases | At December 31, 2018, aggregate annual future minimum lease payments under these leases are as follows:
(in thousands) | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 and beyond |  | Total
Minimum lease payments | $ | 6,244 |  |  | $ | 4,063 |  |  | $ | 3,560 |  |  | $ | 3,371 |  |  | $ | 13,649 |  |  | $ | 30,887 |
Schedule of aggregate annual future minimum lease payments under the capital leases, including interest | At December 31, 2018, aggregate annual future minimum lease payments under these leases, including interest, are as follows (in thousands):
Years ending December 31: |
2019 | $ | 194 |
2020 | 60 |
2021 | 47 |
2022 | 30 |
2023 and beyond | — |
Total principal obligation | $ | 331 |

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- Definition Tabular disclosure of future minimum lease payments as of the date of the latest balance sheet presented, in aggregate and for each of the five years succeeding fiscal years, with separate deductions from the total for the amount representing executor costs, including any profit thereon, included in the minimum lease payments and for the amount of the imputed interest necessary to reduce the net minimum lease payments to present value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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- Definition Tabular disclosure of real estate properties and units in those properties that are included in the discussion of the nature of an entity's operations. + References No definition available. + Details
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