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Summary of significant accounting policies - Narrative 1 (Details) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 USD ($) item issuer instrument | Dec. 31, 2017 USD ($)
Concentrations of Credit Risk |  |
Number of issuer to which company limits the amount of credit exposure other than US Government guaranteed securities | issuer | 1 |
Number of financial investment to which company limits the amount of credit exposure other than US Government guaranteed securities | instrument | 1 |
Accounts Receivable |  |
Allowance for doubtful accounts | $ | $ 0 | $ 0
Variable Interest Entities |  |
Number of entities in which variable interest held | item | 0 |
JAKAFI |  |
Inventory |  |
Shelf life for finished goods inventory, maximum | 36 months |
ICLUSIG |  |
Inventory |  |
Shelf life for finished goods inventory, maximum | 24 months |

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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