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Fair value of financial instruments and marketable securities (Details 2) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Marketable securities accounted for as available-for-sale securities |  |
Amortized Cost | $ 281,492 | $ 265,880
Gross Unrealized Gains | 83 | 87
Gross Unrealized Losses | (672) | (474)
Marketable securities | 280,903 | 265,493
Transfers of assets between Level 1 and Level 2 of the fair value measurement hierarchy | 0 |
Commercial paper |  |
Marketable securities accounted for as available-for-sale securities |  |
Amortized Cost | 26,877 |
Gross Unrealized Gains | 80 |
Marketable securities | 26,957 |
Corporate debt securities |  |
Marketable securities accounted for as available-for-sale securities |  |
Amortized Cost | 226,959 | 230,379
Gross Unrealized Gains |  | 80
Gross Unrealized Losses | (640) | (428)
Marketable securities | 226,319 | 230,031
Government obligations |  |
Marketable securities accounted for as available-for-sale securities |  |
Amortized Cost | 27,656 | 35,501
Gross Unrealized Gains | 3 | 7
Gross Unrealized Losses | (32) | (46)
Marketable securities | $ 27,627 | $ 35,462

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