Commitments and contingencies (Details) - Jun. 30, 2015 $ in Thousands	USD ($) item
Other matters
Number of internal audits related to venue partners | item	1
Possible loss, mimimum	$ 0
Possible loss, maximun	3,000
Letter of Credit
Comitments and contingencies
Amount of Letters of Credit that allows entity to draw	$ 3,891
Number of drafts drawn under Letters of Credit | item	0