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Fair value of financial instruments and marketable securities - Available for sale (Details) - USD ($) | Sep. 30, 2016 | Dec. 31, 2015
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Marketable securities accounted for as available-for-sale securities |  |
Amortized Cost | $ 197,990,000 | $ 281,492,000
Gross Unrealized Gains | 171,000 | 83,000
Gross Unrealized Losses | (109,000) | (672,000)
Fair Value | 198,052,000 | 280,903,000
Transfers of assets between Level 1 and Level 2 of the fair value measurement hierarchy | 0 | 0
Commercial paper |  |
Marketable securities accounted for as available-for-sale securities |  |
Amortized Cost | 17,935,000 | 26,877,000
Gross Unrealized Gains | 53,000 | 80,000
Gross Unrealized Losses | 0 | 0
Fair Value | 17,988,000 | 26,957,000
Corporate debt securities |  |
Marketable securities accounted for as available-for-sale securities |  |
Amortized Cost | 166,119,000 | 226,959,000
Gross Unrealized Gains | 110,000 | 0
Gross Unrealized Losses | (109,000) | (640,000)
Fair Value | 166,120,000 | 226,319,000
Government obligations |  |
Marketable securities accounted for as available-for-sale securities |  |
Amortized Cost | 13,936,000 | 27,656,000
Gross Unrealized Gains | 8,000 | 3,000
Gross Unrealized Losses | 0 | (32,000)
Fair Value | $ 13,944,000 | $ 27,627,000

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 + Details
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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=27724398&loc=d3e27161-111563 + Details
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