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Fair value measurements (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Liabilities [Abstract] |  |  |
Payment of contingent obligations |  |  |
Unobservable Input Reconciliation [Roll Forward] |  |  |
Balance, beginning of period |  | $ 25,155 | 40,037
Expense (income) included in earnings |  | (10,857) | (10,884)
Settlements |  | (1,113) | (4,803)
Purchases, sales and issuances |  | 0 | 805
Transfers in/(out) of Level 3 |  | 0 | 0
Balance, end of period |  | 13,185 | 25,155
RSDL [Member] |  |  |
Liabilities [Abstract] |  |  |
Fair value adjustment for contingent obligations |  | (5,400) | (1,500)
Evolva Holding SA 035 & Unither [Member] |  |  |
Liabilities [Abstract] |  |  |
Fair value adjustment for contingent obligations |  | (5,400) | (9,400)
Unobservable Input Reconciliation [Roll Forward] |  |  |
Contingent value rights based on the novation of the contract |  |  | 4,000
Fair Value, Measurements, Recurring [Member] |  |  |
Assets [Abstract] |  |  |
Investment in money market funds | [1] | 10 | 3,323
Total assets |  | 10 | 3,323
Liabilities [Abstract] |  |  |
Contingent price consideration |  | 13,185 | 25,155
Total liabilities |  | 13,185 | 25,155
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Assets [Abstract] |  |  |
Investment in money market funds | [1] | 10 | 3,323
Total assets |  | 10 | 3,323
Liabilities [Abstract] |  |  |
Contingent price consideration |  | 0 | 0
Total liabilities |  | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Assets [Abstract] |  |  |
Investment in money market funds | [1] | 0 | 0
Total assets |  | 0 | 0
Liabilities [Abstract] |  |  |
Contingent price consideration |  | 0 | 0
Total liabilities |  | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Assets [Abstract] |  |  |
Investment in money market funds | [1] | 0 | 0
Total assets |  | 0 | 0
Liabilities [Abstract] |  |  |
Contingent price consideration |  | 13,185 | 25,155
Total liabilities |  | $ 13,185 | $ 25,155
[1] | Included in cash and cash equivalents in accompanying consolidated balance sheets.

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- Definition Refers to the contingent value rights based on the novation of the contract with an agency. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents a type of right given to shareholders of an acquired company (or a company facing major restructuring) that ensures they receive additional benefit if a specified event occurs. + References No definition available. + Details
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- Definition Amount of purchases, sales, and issuances in relation to liabilities measured at fair value on a recurring basis using unobservable inputs (level 3). + References No definition available. + Details
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- Definition The cash outflow associated with the acquisition of a business' contingent purchase price. + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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