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v3.19.2

Operating Leases (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) Option | Jun. 30, 2018 USD ($)
Operating Leases [Abstract] |  |  |  |  |
Right-of-use operating lease assets | [1] | $ 12,900 |  | $ 12,900 |
Operating lease liabilties | [2] | $ 17,677 |  | $ 17,677 |
Weighted average remaining lease term |  | 8 years 8 months 12 days |  | 8 years 8 months 12 days |
Weighted average discount rate |  | 7.60% |  | 7.60% |
Current portion of operating lease liabilties |  | $ 1,900 |  | $ 1,900 |
Operating lease cash payments |  |  |  | 2,000 |
Annual Future Minimum Payments Under Operating Leases [Abstract] |  |  |  |  |
Remainder of 2019 |  | 1,548 |  | 1,548 |
2020 |  | 3,124 |  | 3,124 |
2021 |  | 2,855 |  | 2,855 |
2022 |  | 2,607 |  | 2,607 |
2023 |  | 2,505 |  | 2,505 |
Thereafter |  | 11,861 |  | 11,861 |
Total minimum lease payments |  | 24,500 |  | 24,500 |
Imputed interest |  | (6,823) |  | (6,823) |
Total lease liabilities | [2] | 17,677 |  | 17,677 |
Rent expense |  | $ 1,000 | $ 900 | $ 1,900 | $ 900
Office and Laboratory Space Adjacent to Manufacturing Facility [Member] |  |  |  |  |
Operating Leases [Abstract] |  |  |  |  |
Number of options to extend lease | Option |  |  |  | 2 |
Term of lease extension |  | 5 years |  | 5 years |
Office Space Subleased to Akcea [Member] |  |  |  |  |
Operating Leases [Abstract] |  |  |  |  |
Number of options to extend lease | Option |  |  |  | 1 |
Term of lease extension |  | 5 years |  | 5 years |
Akcea [Member] | Office Space for Corporate Headquarters [Member] |  |  |  |  |
Operating Leases [Abstract] |  |  |  |  |
Term of lease extension |  | 5 years |  | 5 years |
Term of lease |  | 123 months |  | 123 months |
Period of free rent under lease |  |  |  | 3 months |
Tenant improvement allowance |  | $ 3,800 |  | $ 3,800 |
Initial amount of letter of credit |  | 2,400 |  | 2,400 |
Letter of credit on third anniversary of rent commencement date |  | 1,800 |  | 1,800 |
Letter of credit on fifth anniversary of rent commencement date |  | $ 1,200 |  | $ 1,200 |
[1] | Included in deposits and other assets on our condensed consolidated balance sheet.
[2] | Current portion of $1.9 million was included in current portion of long-term obligations on our condensed consolidated balance sheet, with the difference included in long-term obligations.

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