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v3.19.1

Fair value of financial instruments - Fair value on a recurring basis (Details) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2018
Fair value of financial instruments |  |  |  |  |  |
Assets transfers from Level 1 to Level 2 | $ 0 |  |  |  |  |
Assets transfers from Level 2 to Level 1 | 0 |  |  |  |  |
Assets transfers into Level 3 | 0 |  |  |  |  |
Assets transfers out of Level 3 | 0 |  |  |  |  |
Liabilities transfers from Level 1 to Level 2 | 0 |  |  |  |  |
Liabilities transfers from Level 2 to Level 1 | 0 |  |  |  |  |
Liabilities transfers into Level 3 | 0 |  |  |  |  |
Liabilities transfers out of Level 3 | 0 |  |  |  |  |
Long term investments | 120,188 | $ 99,199 | [1] |  | $ 99,199 | [1]
ARIAD |  |  |  |  |  |
Roll forward of Level 3 liabilities |  |  |  |  |  |
Contingent consideration earned during the period but not yet paid | (6,700) |  |  |  | (13,200) |
ARIAD | Account payable |  |  |  |  |  |
Roll forward of Level 3 liabilities |  |  |  |  |  |
Contingent consideration earned during the period but not yet paid |  |  |  | $ (6,700) |  |
ARIAD | Accrued and other current liabilities |  |  |  |  |  |
Roll forward of Level 3 liabilities |  |  |  |  |  |
Contingent consideration earned during the period but not yet paid | (6,700) | (6,500) |  |  |  |
Level 3 | Fair Value |  |  |  |  |  |
Roll forward of Level 3 liabilities |  |  |  |  |  |
Balance at the beginning of the period | 287,001 |  |  |  |  |
Contingent consideration earned during the period but not yet paid | (6,672) |  |  |  |  |
Change in fair value of contingent consideration | 6,671 |  |  |  |  |
Balance at the end of the period | 287,000 | 287,001 |  |  | 287,001 |
Recurring | Fair Value |  |  |  |  |  |
Fair value of financial instruments |  |  |  |  |  |
Cash and cash equivalents | 1,299,704 | 1,163,980 |  |  | 1,163,980 |
Debt securities (corporate and government) | 281,320 | 274,343 |  |  | 274,343 |
Long term investments | 120,188 | 99,199 |  |  | 99,199 |
Total assets | 1,701,212 | 1,537,522 |  |  | 1,537,522 |
Acquisition-related contingent consideration | 287,000 | 287,001 |  |  | 287,001 |
Total liabilities | 287,000 | 287,001 |  |  | 287,001 |
Recurring | Level 1 |  |  |  |  |  |
Fair value of financial instruments |  |  |  |  |  |
Cash and cash equivalents | 1,299,704 | 1,163,980 |  |  | 1,163,980 |
Long term investments | 120,188 | 99,199 |  |  | 99,199 |
Total assets | 1,419,892 | 1,263,179 |  |  | 1,263,179 |
Recurring | Level 2 |  |  |  |  |  |
Fair value of financial instruments |  |  |  |  |  |
Debt securities (corporate and government) | 281,320 | 274,343 |  |  | 274,343 |
Total assets | 281,320 | 274,343 |  |  | 274,343 |
Recurring | Level 3 |  |  |  |  |  |
Fair value of financial instruments |  |  |  |  |  |
Acquisition-related contingent consideration | 287,000 | 287,001 |  |  | 287,001 |
Total liabilities | $ 287,000 | $ 287,001 |  |  | $ 287,001 |
[1] | The condensed consolidated balance sheet at December 31, 2018 has been derived from the audited financial statements at that date.

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