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Right-of-use asset and lease liabilities (Tables) | 6 Months Ended
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Jun. 30, 2019
Schedule of lease cost, balance sheet and cash flow information | The components of lease cost were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three months ended |  | Six months ended
​ | ​ | June 30, 2019 | ​ | June 30, 2019
​ | ​ | (in thousands)
Operating lease cost | ​ | $ | 1,022 | ​ | $ | 1,919
Variable lease cost | ​ | ​ | 101 | ​ | ​ | 182
Sublease income | ​ | ​ | (264) | ​ | ​ | (532)
Total lease cost | ​ | $ | 859 | ​ | $ | 1,569
​ The rent expense for the three and six months ended June 30, 2018 was $0.7 million and $1.4 million, respectively. ​ The table below presents the lease-related assets and liabilities recorded on the Consolidated balance sheet. ​
​ | ​ | ​ | ​
​ |  | June 30, 2019
​ | ​ | (in thousands)
Assets | ​ | ​ | ​
Operating lease right-of-use assets | ​ | $ | 27,173
Liabilities | ​ | ​ | ​
Current | ​ | ​ | ​
Current operating lease liabilities, net of $1.5 million landlord incentive payments expected to be collected within 12 months | ​ | ​ | 4,256
Non-current | ​ | ​ | ​
Non-current operating lease liabilities | ​ | ​ | 31,870
Total lease liabilities | ​ | $ | 36,126
​ Other information ​ The weighted-average remaining lease term as of June 30, 2019 is 10.9 years and the weighted-average discount rate as of this date is 11.35%. ​ The table below presents supplemental cash flow and non-cash information related to leases. ​
​ ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three months ended |  | Six months ended
​ | ​ | June 30, 2019 | ​ | June 30, 2019
​ | ​ | (in thousands) | ​ | (in thousands)
Cash paid for amounts included in the measurement of lease liabilities | ​ | ​ | ​ | ​ | ​ | ​
Operating cash flows for operating leases | ​ | $ | 603 | ​ | $ | 2,016
​ | ​ | ​ | ​ | ​ | ​ | ​
Right-of-use asset obtained in exchange for lease obligation | ​ | ​ | ​ | ​ | ​ | ​
Operating lease 1) | ​ | $ | 8,634 | ​ | $ | 8,634
Schedule of undiscounted cash flows and minimum lease payments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Lexington | ​ | Amsterdam1) | ​ | Total
​ | (in thousands)
2019 (six months remaining) | $ | 1,650 | ​ | $ | 1,438 | ​ | $ | 3,088
2020 | ​ | 3,360 | ​ | ​ | 1,918 | ​ | ​ | 5,278
2021 | ​ | 3,455 | ​ | ​ | 1,918 | ​ | ​ | 5,373
2022 | ​ | 3,552 | ​ | ​ | 1,918 | ​ | ​ | 5,470
2023 | ​ | 3,650 | ​ | ​ | 1,918 | ​ | ​ | 5,568
Thereafter | ​ | 24,892 | ​ | ​ | 15,343 | ​ | ​ | 40,235
Total lease payments | $ | 40,559 | ​ | $ | 24,453 | ​ | $ | 65,012
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Less: amount of lease payments representing interest payments | ​ | (17,728) | ​ | ​ | (11,158) | ​ | ​ | (28,886)
Present value of lease payments | ​ | 22,831 | ​ | ​ | 13,295 | ​ | ​ | 36,126
Less: current operating lease liabilities | ​ | (1,859) | ​ | ​ | (2,397) | ​ | ​ | (4,256)
Non-current operating lease liabilities | $ | 20,972 | ​ | $ | 10,898 | ​ | $ | 31,870
​ (1) Payments are due in EUR and have been translated at the foreign exchange rate as of June 30, 2019, of $1.13709 / €1.00) ​ As of December 31, 2018, aggregate minimum lease payments under the historical accounting standard ASC 840 for the calendar years were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Lexington | ​ | Amsterdam1) | ​ | Total
​ | (in thousands)
2019 | $ | 2,707 | ​ | $ | 1,963 | ​ | $ | 4,670
2020 | ​ | 3,360 | ​ | ​ | 1,970 | ​ | ​ | 5,330
2021 | ​ | 3,455 | ​ | ​ | 1,970 | ​ | ​ | 5,425
2022 | ​ | 3,552 | ​ | ​ | 1,970 | ​ | ​ | 5,522
2023 | ​ | 3,650 | ​ | ​ | 1,970 | ​ | ​ | 5,620
Thereafter | ​ | 24,892 | ​ | ​ | 16,085 | ​ | ​ | 40,977
Total minimum lease payments | $ | 41,616 | ​ | $ | 25,926 | ​ | $ | 67,544
​ ​ (1) Payments are due in EUR and have been translated at the foreign exchange rate as of December 31, 2018, of $1.14449 / €1.00)
Schedule of minimum lease payments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Lexington | ​ | Amsterdam1) | ​ | Total
​ | (in thousands)
2019 | $ | 2,707 | ​ | $ | 1,963 | ​ | $ | 4,670
2020 | ​ | 3,360 | ​ | ​ | 1,970 | ​ | ​ | 5,330
2021 | ​ | 3,455 | ​ | ​ | 1,970 | ​ | ​ | 5,425
2022 | ​ | 3,552 | ​ | ​ | 1,970 | ​ | ​ | 5,522
2023 | ​ | 3,650 | ​ | ​ | 1,970 | ​ | ​ | 5,620
Thereafter | ​ | 24,892 | ​ | ​ | 16,085 | ​ | ​ | 40,977
Total minimum lease payments | $ | 41,616 | ​ | $ | 25,926 | ​ | $ | 67,544

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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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- 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/otherTransitionRef -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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