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Stockholders' equity (deficit) and redeemable convertible preferred stock Common stock (Details) - shares | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Class of Stock [Line Items] |  |
Common Stock, Shares Authorized | 500,000,000.0 |
Common Class A [Member] |  |
Class of Stock [Line Items] |  |
Common Stock, Shares Authorized | 500,000,000 | 500,000,000
Common Stock, Shares, Issued | 100,596,000 | 52,091,000
Common Class B [Member] |  |
Class of Stock [Line Items] |  |
Common Stock, Shares Authorized | 150,000,000 | 150,000,000
Common Stock, Shares, Issued | 36,005,000 | 77,023,000

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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