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Stockholders' equity (deficit) and redeemable convertible preferred stock (Details)
1 Months Ended 3 Months Ended 12 Months Ended
May. 31, 2015
shares
Apr. 30, 2015
shares
Jun. 30, 2014
vote
Jun. 30, 2015
shares
Dec. 31, 2015
shares
Dec. 31, 2014
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Preferred Stock, Shares Authorized         5,000,000 5,000,000
Preferred Stock, Shares Issued         0 0
Common Stock, Shares Authorized         500,000,000.0  
Stockholders' Equity Note, Outstanding Shares Less than 10% of Aggregate Shares Outstanding, Conversion Ratio     1      
Series A Preferred Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Temporary Equity, Shares Issued         30,523,036  
Common Class A [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common Stock, Shares Authorized         500,000,000 500,000,000
Common Stock, Shares, Issued         100,596,000 52,091,000
Common Stock, Voting Rights, Number | vote     1      
Common Class B [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common Stock, Conversion Basis         1-for-1  
Common Stock, Shares Authorized         150,000,000 150,000,000
Common Stock, Shares, Issued         36,005,000 77,023,000
Common Stock, Voting Rights, Number | vote     10      
Class A [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common Stock, Conversion Basis     1      
Chief Executive Officer (CEO) [Member] | Common Class B [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Shares Contributed to Company Without Consideration 4,678,180 540,000   5,218,180