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v3.20.1

Fair value of financial instruments - Fair value on a recurring basis (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 01, 2016 | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Fair value of financial instruments |  |  |  |
Long term investments (Note 6) |  | $ 180,993 | $ 133,657 | [1]
ARIAD | Contingent Consideration |  |  |  |
Roll forward of Level 3 liabilities |  |  |  |
Projected cash flows period | 18 years |  |  |
ARIAD | Discount rate | Contingent Consideration |  |  |  |
Roll forward of Level 3 liabilities |  |  |  |
Valuation input (as a percent) | 0.10 |  |  |
ARIAD | Average Cost of Capital | Contingent Consideration |  |  |  |
Roll forward of Level 3 liabilities |  |  |  |
Valuation input (as a percent) |  | 0.10 |  |
ARIAD | Accrued and other current liabilities |  |  |  |
Roll forward of Level 3 liabilities |  |  |  |
Contingent consideration earned during the period but not yet paid |  | $ (8,600) | (23,000) |
Level 3 | Fair Value |  |  |  |
Roll forward of Level 3 liabilities |  |  |  |
Balance at the beginning of the period |  | 277,000 |  |
Contingent consideration earned during the period but not yet paid |  | (8,627) |  |
Change in fair value of contingent consideration |  | 6,627 |  |
Balance at the end of the period |  | 275,000 | 277,000 |
Recurring | Fair Value |  |  |  |
Fair value of financial instruments |  |  |  |
Cash and cash equivalents |  | 1,043,241 | 1,832,684 |
Debt securities (government) |  | 259,351 | 284,870 |
Long term investments (Note 6) |  | 180,993 | 133,657 |
Total assets |  | 1,483,585 | 2,251,211 |
Acquisition-related contingent consideration |  | 275,000 | 277,000 |
Total liabilities |  | 275,000 | 277,000 |
Recurring | Level 1 |  |  |  |
Fair value of financial instruments |  |  |  |
Cash and cash equivalents |  | 1,043,241 | 1,832,684 |
Long term investments (Note 6) |  | 180,993 | 133,657 |
Total assets |  | 1,224,234 | 1,966,341 |
Recurring | Level 2 |  |  |  |
Fair value of financial instruments |  |  |  |
Debt securities (government) |  | 259,351 | 284,870 |
Total assets |  | 259,351 | 284,870 |
Recurring | Level 3 |  |  |  |
Fair value of financial instruments |  |  |  |
Acquisition-related contingent consideration |  | 275,000 | 277,000 |
Total liabilities |  | $ 275,000 | $ 277,000 |
[1] | The condensed consolidated balance sheet at December 31, 2019 has been derived from the audited consolidated financial statements at that date.

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