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Stockholders' equity (deficit) and redeemable convertible preferred stock - Common Stock Reserved for Issuance (Details) - shares
shares in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 13,081 25,134  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 37,803    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 4,638 4,307 270
Stock Options, Restricted stock, and Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 0 17  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 20,084