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Fair value of financial instruments and investments - Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financial assets and liabilities measured at fair value on recurring basis |  |
Marketable securities | $ 79,454 | $ 173,345
Recurring basis | Quoted prices in active markets for identical assets (level 1) |  |
Financial assets and liabilities measured at fair value on recurring basis |  |
Marketable securities | 0 | 0
Warrant liability | 0 | 0
Stock appreciation rights liability | 0 | 0
Recurring basis | Significant other observable inputs (level 2) |  |
Financial assets and liabilities measured at fair value on recurring basis |  |
Marketable securities | 79,454 | 173,345
Warrant liability | 0 | 0
Stock appreciation rights liability | 0 | 0
Recurring basis | Significant unobservable inputs (level 3) |  |
Financial assets and liabilities measured at fair value on recurring basis |  |
Marketable securities | 0 | 0
Warrant liability | 1 | 1
Stock appreciation rights liability | 1,665 | 865
Recurring basis | Total |  |
Financial assets and liabilities measured at fair value on recurring basis |  |
Marketable securities | 79,454 | 173,345
Warrant liability | 1 | 1
Stock appreciation rights liability | $ 1,665 | $ 865

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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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- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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