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Stockholders' equity (deficit) and redeemable convertible preferred stock - Initial public offering and Follow-on offering (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 01, 2014 | Nov. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014
Class of Stock [Line Items] |  |  |  |
Preferred Stock, Shares Issued |  |  | 0 | 0
IPO [Member] | Common Class A [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock Issued During Period, Shares, New Issues | 8,900,000.0 |  |  |
Share Price | $ 24.00 |  |  |
Stock Sold by Stockholders During Period, Shares, Underwritten Public Offering | 11,570,000 |  |  |
Stock Sold by Stockholders During Period, Shares, Over-allotment Option in Underwritten Public Offering | 2,670,000 |  |  |
Proceeds from Issuance Initial Public Offering | $ 200.8 | $ 93.2 |  |
Underwriting Discounts And Commissions | 12.8 |  |  |
Total Offering Costs | $ 6.2 |  |  |
Follow-on Offering [Member] | Common Class A [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 1,287,533 |  |
Share Price |  | $ 75.00 |  |
Stock Sold by Stockholders During Period, Shares, Underwritten Public Offering |  | 10,627,042 |  |
Stock Sold by Stockholders During Period, Shares, Over-allotment Option in Underwritten Public Offering |  | 1,554,075 |  |
Underwriting Discounts And Commissions |  | $ 3.4 |  |
Total Offering Costs |  | $ 1.5 |  |

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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + 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 210.5-02.28) -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 29 -Article 5 + Details
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