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Commitments and contingencies (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
item
claim
Underpaid revenue share payments and related interest  
Other matters  
Number of claim received | claim 1
Claim value $ 4,600
Letters of Credit  
Commitments and contingencies  
Current issued borrowing capacity $ 4,016
Term period of Letters of Credit agreements 1 year
Number of drafts drawn under Letters of Credit | item 0