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Stockholders' equity (deficit) and redeemable convertible preferred stock (Notes) | 12 Months Ended
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Dec. 31, 2015
Stockholders' Equity Attributable to Parent [Abstract] |
Stockholders' equity (deficit) and redeemable convertible preferred stock | Stockholders' equity (deficit) and redeemable convertible preferred stock Initial public offering In July 2014, the Company completed its IPO in which the Company issued and sold 8.9 million shares of Class A common stock at a public offering price of $24.00 per share and the selling stockholders sold 11.6 million shares of Class A common stock, including 2.7 million shares upon the underwriters' option to purchase additional shares. The Company did not receive any proceeds from the sale of shares by the selling stockholders. The total net proceeds received by the Company from the IPO were $200.8 million after deducting underwriting discounts and commissions of $12.8 million and other offering expenses of approximately $6.2 million. Follow-on offering In November 2014, the Company completed a follow-on offering in which the Company issued and sold 1.3 million shares of Class A common stock at a public offering price of $75.00 per share and the selling stockholders sold 10.6 million shares of Class A common stock, including 1.6 million shares upon the underwriters' option to purchase additional shares. The Company did not receive any proceeds from the sale of shares by the selling stockholders. The total net proceeds received by the Company from the follow-on offering were $93.2 million after deducting underwriting discounts and commissions of $3.4 million and other offering expenses of approximately $1.5 million. Redeemable convertible preferred stock Prior to the Company's IPO, the Company had 30.5 million of Series A redeemable convertible preferred stock outstanding, which were convertible into shares of Class B common stock at a rate of 1-for-1. Concurrent with the close of the IPO, those outstanding shares were converted into Class B common stock. Preferred stock Following the Company's IPO, the Company had 5.0 million shares of preferred stock authorized, none of which was issued or outstanding at December 31, 2015 and 2014. Common stock Following the Company's IPO, the Company had two classes of authorized common stock: Class A common stock with 500.0 million shares authorized and Class B common stock with 150.0 million shares authorized. As of December 31, 2015, 100.6 million shares of Class A stock were issued and outstanding and 36.0 million shares of Class B stock were issued and outstanding. The rights of the holders of Class A and Class B common stock are identical, except with respect to voting power and conversion rights. Each share of Class A common stock is entitled to one vote per share and each share of Class B common stock is entitled to ten votes per share. Each share of Class B common stock is convertible at any time at the option of the stockholder into one share of Class A common stock and has no expiration date. The Class B common stock is also convertible into Class A common stock on the same basis upon any transfer, whether or not for value, except for “permitted transfers” as defined in the Company’s restated certificate of incorporation. Each share of Class B common stock will convert automatically into one share of Class A common stock upon the date when the outstanding shares of Class B common stock represent less than 10% of the aggregate number of shares of common stock then outstanding. As of December 31, 2015, the Class B stock continued to represent greater than 10% of the overall outstanding shares. The Company had the following shares of common stock reserved for issuance upon the exercise of equity instruments as of December 31, 2015:
(in thousands) | December 31, 2015
Stock options outstanding | 13,081 |
Restricted stock units outstanding | 4,638 |
Common stock available for future grants | 20,084 |
Total common stock shares reserved for issuance | 37,803 |
Stock repurchase program On September 30, 2015, the Company's board of directors authorized a program to repurchase up to $300.0 million of the Company's Class A common stock. The repurchase program, which expires in September 2016, does not obligate the Company to acquire any specific number of shares and may be discontinued or extended at any time by the board of directors. Share repurchases under the program may be made from time-to-time through open market transactions, block trades, privately negotiated transactions or otherwise, including under plans complying with both Rule 10b-18 and Rule 10b5-1 under the Securities Exchange Act of 1934, as amended. During the fourth quarter of 2015, under the program, the Company repurchased approximately 1.5 million shares of its common stock at an average price of $23.05 per share, for an aggregate purchase price of approximately $35.6 million. The Company currently intends to hold the repurchased shares as treasury stock. CEO stock contributions In 2015, the CEO contributed an aggregate 5.2 million shares of Class B common stock to the Company without consideration per the terms of a Contribution Agreement dated December 28, 2011, and amended on May 11, 2015. Under the original Contribution Agreement, the CEO agreed to contribute back to the Company from time-to-time the same number of shares of common stock as are issued to a certain Company employee upon the exercise of certain stock options held by such employee. Pursuant to this agreement, the CEO contributed back to the Company 0.5 million shares of Class B common stock from January 2015 through April 2015. In May 2015, the CEO contributed back to the Company 4.7 million shares of Class B common stock pursuant to the amended agreement, representing all of the then remaining shares subject to the contribution obligations. All of the shares contributed by the CEO were retired during the year.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d),(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Preferred Stock -URI http://asc.fasb.org/extlink&oid=6521494 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph d -Article 4 Reference 15: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 16: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 17: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Article 4 Reference 18: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section C Reference 19: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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