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Fair value of financial instruments and marketable securities (Details 2) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
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Marketable securities accounted for as available-for-sale securities |  |
Transfers of assets between Level 1 and Level 2 of the fair value measurement hierarchy | $ 0 |
Amortized Cost | 173,347,000 | $ 281,492,000
Gross Unrealized Gains | 101,000 | 83,000
Gross Unrealized Losses | (103,000) | (672,000)
Fair Value | 173,345,000 | 280,903,000
Commercial paper |  |
Marketable securities accounted for as available-for-sale securities |  |
Amortized Cost | 12,919,000 | 26,877,000
Gross Unrealized Gains | 47,000 | 80,000
Gross Unrealized Losses | 0 | 0
Fair Value | 12,966,000 | 26,957,000
Corporate debt securities |  |
Marketable securities accounted for as available-for-sale securities |  |
Amortized Cost | 153,240,000 | 226,959,000
Gross Unrealized Gains | 52,000 | 0
Gross Unrealized Losses | (103,000) | (640,000)
Fair Value | 153,189,000 | 226,319,000
Government obligations |  |
Marketable securities accounted for as available-for-sale securities |  |
Amortized Cost | 7,188,000 | 27,656,000
Gross Unrealized Gains | 2,000 | 3,000
Gross Unrealized Losses | 0 | (32,000)
Fair Value | $ 7,190,000 | $ 27,627,000

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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