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Fair value of financial instruments and investments - Marketable Securities, Unrealized Gains (Losses) (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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Fair Value Disclosures [Abstract] |  |
Transfers of assets between Level 1 and Level 2 of the fair value measurement hierarchy | $ 0 |
Marketable securities accounted for as available-for-sale securities |  |
Amortized Cost | 79,432,000 | $ 173,347,000
Gross Unrealized Gains | 52,000 | 101,000
Gross Unrealized Losses | (30,000) | (103,000)
Fair Value | 79,454,000 | 173,345,000
Commercial paper |  |
Marketable securities accounted for as available-for-sale securities |  |
Amortized Cost | 13,775,000 | 12,919,000
Gross Unrealized Gains | 52,000 | 47,000
Gross Unrealized Losses | 0 | 0
Fair Value | 13,827,000 | 12,966,000
Corporate debt securities |  |
Marketable securities accounted for as available-for-sale securities |  |
Amortized Cost | 65,657,000 | 153,240,000
Gross Unrealized Gains | 0 | 52,000
Gross Unrealized Losses | (30,000) | (103,000)
Fair Value | 65,627,000 | 153,189,000
Government obligations |  |
Marketable securities accounted for as available-for-sale securities |  |
Amortized Cost | 0 | 7,188,000
Gross Unrealized Gains | 0 | 2,000
Gross Unrealized Losses | 0 | 0
Fair Value | $ 0 | $ 7,190,000

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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=75030427&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=82897076&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=82896770&loc=d3e26610-111562 + Details
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