Redeemable convertible preferred stock	12 Months Ended
Dec. 31, 2014
Equity [Abstract]
Redeemable convertible preferred stock	Redeemable convertible preferred stock As of December 31, 2013, there were 36,000,000 shares of Series A preferred stock authorized and 30,523,036 shares of Series A preferred stock issued and outstanding. Concurrent with the close of the IPO in July 2014, all shares of Series A preferred stock were converted into Class B common stock. Prior to their conversion to Class B common stock, the Series A preferred stock had the following terms: Conversion Each share of Series A preferred stock was convertible, at the option of the holder, into shares of common stock at a rate of 1-for-1. The conversion of all outstanding Series A preferred stock occurred in connection with the closing of the IPO. Voting rights The holders of shares of the Company’s Series A preferred stock voted equally with shares of Class B common stock on an as-if converted to common stock basis on all matters, including the election of directors. Dividend rights The holders of each Series A share were entitled to receive any noncumulative dividends on an equal basis with common stock, when and if declared by the Board. Redemption rights In the event of any liquidation, dissolution, or winding up of the Company, whether voluntary or involuntary, the Company was required to redeem shares of Series A preferred stock at the original issue price of $2.53 per share plus any noncumulative dividends declared by the Board. If the holders had not previously exercised the rights granted to them, the Series A preferred stock was redeemable within 365 days after July 1, 2017, subject to a majority vote of the then outstanding Series A preferred shares. As the redemption events described above could have occurred and were not solely within the Company’s control, all shares of preferred stock were presented outside of permanent equity.

Redeemable convertible preferred stock

As of December 31, 2013, there were 36,000,000 shares of Series A preferred stock authorized and 30,523,036 shares of Series A preferred stock issued and outstanding. Concurrent with the close of the IPO in July 2014, all shares of Series A preferred stock were converted into Class B common stock. Prior to their conversion to Class B common stock, the Series A preferred stock had the following terms:

Conversion

Each share of Series A preferred stock was convertible, at the option of the holder, into shares of common stock at a rate of 1-for-1. The conversion of all outstanding Series A preferred stock occurred in connection with the closing of the IPO.

Voting rights

The holders of shares of the Company’s Series A preferred stock voted equally with shares of Class B common stock on an as-if converted to common stock basis on all matters, including the election of directors.

Dividend rights

The holders of each Series A share were entitled to receive any noncumulative dividends on an equal basis with common stock, when and if declared by the Board.

Redemption rights

In the event of any liquidation, dissolution, or winding up of the Company, whether voluntary or involuntary, the Company was required to redeem shares of Series A preferred stock at the original issue price of $2.53 per share plus any noncumulative dividends declared by the Board. If the holders had not previously exercised the rights granted to them, the Series A preferred stock was redeemable within 365 days after July 1, 2017, subject to a majority vote of the then outstanding Series A preferred shares. As the redemption events described above could have occurred and were not solely within the Company’s control, all shares of preferred stock were presented outside of permanent equity.