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Commitments and contingencies (Details)
9 Months Ended
Sep. 30, 2017
USD ($)
claim
Underpaid revenue share payments and related interest  
Other Matters [Abstract]  
Number of claim received | claim 1
Claim value $ 4,600,000
Letters of Credit  
Commitments and contingencies  
Current issued borrowing capacity 6,275,000
Outstanding balance $ 0
Letters of Credit | Maximum  
Commitments and contingencies  
Term period of Letters of Credit agreements 1 year