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Equity Activity of Stock Options (Details) | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) $ / shares shares
Number of Shares |  |
Outstanding, beginning of period (in shares) | shares | 16,474,227 |
Granted (in shares) | shares | 75,100 |
Exercised (in shares) | shares | (2,220,881) |
Unvested options forfeited (in shares) | shares | (239,322) |
Vested options expired (in shares) | shares | (69,495) |
Outstanding, end of period (in shares) | shares | 14,019,629 |
Vested at end of period (in shares) | shares | 10,951,694 |
Exercisable options, vested and expected to vest (in shares) | shares | 13,917,122 | [1]
Weighted- Average Exercise Price |  |
Outstanding, weighted average exercise price, beginning of period (in dollars per share) | $ / shares | $ 3.43 |
Granted, weighted average exercise price (in dollars per share) | $ / shares | 9.66 |
Exercised, weighted average exercise price (in dollars per share) | $ / shares | 2.08 |
Unvested options forfeited weighted-average exercise price (in dollars per share) | $ / shares | 6.66 |
Vested options expired weighted-average exercise price (in dollars per share) | $ / shares | 2.61 |
Outstanding, weighted average exercise price, end of period (in dollars per share) | $ / shares | 3.62 |
Vested at end of period weighted average exercise price (in dollars per share) | $ / shares | 2.80 |
Vested and expected to vest, weighted average exercise price (in dollars per share) | $ / shares | $ 3.60 | [1]
Stock options, additional disclosures |  |
Outstanding options, weighted average remaining contractual term | 6 years 6 months |
Vested at end of period weighted average remaining contractual term | 6 years 2 months 12 days |
Vested and expected to vest, weighted average remaining contractual term | 6 years 6 months | [1]
Outstanding intrinsic value | $ | $ 80,740,577 |
Vested at end of period aggregate intrinsic value | $ | 71,955,234 |
Vested and expected to vest, aggregate intrinsic value | $ | $ 80,496,150 | [1]
[1] | Includes forfeiture adjusted unvested shares.

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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