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Equity - Stock Incentive Plans (Details) | 9 Months Ended
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Sep. 30, 2016 USD ($) plan $ / shares shares | Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of share-based compensation plans | plan | 4 |
Number of shares [Roll forward] |  |
Outstanding, beginning of period (in shares) | shares | 14,019,629 |
Granted (in shares) | shares | 0 |
Exercised (in shares) | shares | (926,010) |
Unvested options forfeited (in shares) | shares | (93,097) |
Vested options expired (in shares) | shares | (38,354) |
Outstanding, end of period (in shares) | shares | 12,962,168 |
Vested at end of period (in shares) | shares | 11,818,559 |
Exercisable options, vested and expected to vest (in shares) | shares | 12,937,248 |
Weighted-Average Exercise Price [Roll forward] |  |
Outstanding, weighted average exercise price, beginning of period (in dollars per share) | $ 3.62 |
Granted, weighted average exercise price (in dollars per share) | 0.00 |
Exercised, weighted average exercise price (in dollars per share) | 2.76 |
Unvested options forfeited, weighted-average exercise price (in dollars per share) | 6.52 |
Vested options expired, weighted-average exercise price (in dollars per share) | 6.77 |
Outstanding, weighted average exercise price, end of period (in dollars per share) | 3.65 |
Vested at end of period, weighted average exercise price (in dollars per share) | 3.30 |
Vested and expected to vest, weighted average exercise price (in dollars per share) | $ 3.30 |
Stock options, additional disclosures [Abstract] |  |
Outstanding Options, weighted average remaining contractual term (in years) | 5 years 9 months 7 days |
Vested at end of period, weighted average remaining contractual term (in years) | 5 years 7 months 13 days |
Vested and expected to vest, weighted average remaining contractual term (in years) | 5 years 7 months 13 days |
Outstanding, aggregate intrinsic value | $ | $ 64,153,271 |
Vested at end of period, aggregate intrinsic value | $ | 62,449,678 |
Vested or expected to vest, aggregate intrinsic value | $ | 64,120,370 |
Exercised options, intrinsic value | $ | $ 5,283,449 |
Number of outstanding options (in shares) | shares | 12,962,168 |
Outstanding Options, weighted average remaining contractual term (in years) | 5 years 9 months 7 days |
Outstanding Options, weighted average exercise price (in dollars per share) | $ 3.65 |
Number of exercisable options (in shares) | shares | 11,818,559 |
Exercisable Options, weighted average exercise price (in dollars per share) | $ 3.30 |
Total unrecognized compensation expense | $ | $ 2,150,652 |
Fair value options valuation assumptions [Abstract] |  |
Expected volatility Minimum |  | 54.40%
Expected volatility Maximum |  | 58.10%
Expected life (in years) |  | 6 years
Expected dividend yield |  | 0.00%
Risk-free interest rate Minimum |  | 1.51%
Risk-free interest rate Maximum |  | 1.68%
$0.50 - $0.76 |  |
Stock options, additional disclosures [Abstract] |  |
Outstanding Options, weighted average remaining contractual term (in years) | 2 years 7 months 6 days |
Exercise Price Range, lower range limit (in dollars per share) | $ 0.50 |
Exercise Price Range, upper range limit (in dollars per share) | $ 0.76 |
Number of outstanding options (in shares) | shares | 441,429 |
Outstanding Options, weighted average remaining contractual term (in years) | 2 years 7 months 6 days |
Outstanding Options, weighted average exercise price (in dollars per share) | $ 0.72 |
Number of exercisable options (in shares) | shares | 441,429 |
Exercisable Options, weighted average exercise price (in dollars per share) | $ 0.72 |
$0.87 - $1.35 |  |
Stock options, additional disclosures [Abstract] |  |
Outstanding Options, weighted average remaining contractual term (in years) | 4 years 10 months 24 days |
Exercise Price Range, lower range limit (in dollars per share) | $ 0.87 |
Exercise Price Range, upper range limit (in dollars per share) | $ 1.35 |
Number of outstanding options (in shares) | shares | 4,397,970 |
Outstanding Options, weighted average remaining contractual term (in years) | 4 years 10 months 24 days |
Outstanding Options, weighted average exercise price (in dollars per share) | $ 1.19 |
Number of exercisable options (in shares) | shares | 4,397,970 |
Exercisable Options, weighted average exercise price (in dollars per share) | $ 1.19 |
$1.40 - $2.45 |  |
Stock options, additional disclosures [Abstract] |  |
Outstanding Options, weighted average remaining contractual term (in years) | 4 years 2 months 12 days |
Exercise Price Range, lower range limit (in dollars per share) | $ 1.40 |
Exercise Price Range, upper range limit (in dollars per share) | $ 2.45 |
Number of outstanding options (in shares) | shares | 1,442,424 |
Outstanding Options, weighted average remaining contractual term (in years) | 4 years 2 months 12 days |
Outstanding Options, weighted average exercise price (in dollars per share) | $ 1.92 |
Number of exercisable options (in shares) | shares | 1,442,424 |
Exercisable Options, weighted average exercise price (in dollars per share) | $ 1.92 |
$2.66 - $3.99 |  |
Stock options, additional disclosures [Abstract] |  |
Outstanding Options, weighted average remaining contractual term (in years) | 6 years 1 month 6 days |
Exercise Price Range, lower range limit (in dollars per share) | $ 2.66 |
Exercise Price Range, upper range limit (in dollars per share) | $ 3.99 |
Number of outstanding options (in shares) | shares | 889,430 |
Outstanding Options, weighted average remaining contractual term (in years) | 6 years 1 month 6 days |
Outstanding Options, weighted average exercise price (in dollars per share) | $ 3.06 |
Number of exercisable options (in shares) | shares | 889,430 |
Exercisable Options, weighted average exercise price (in dollars per share) | $ 3.06 |
$4.19 - $6.38 |  |
Stock options, additional disclosures [Abstract] |  |
Outstanding Options, weighted average remaining contractual term (in years) | 6 years 8 months 12 days |
Exercise Price Range, lower range limit (in dollars per share) | $ 4.19 |
Exercise Price Range, upper range limit (in dollars per share) | $ 6.38 |
Number of outstanding options (in shares) | shares | 3,253,783 |
Outstanding Options, weighted average remaining contractual term (in years) | 6 years 8 months 12 days |
Outstanding Options, weighted average exercise price (in dollars per share) | $ 5.36 |
Number of exercisable options (in shares) | shares | 2,997,303 |
Exercisable Options, weighted average exercise price (in dollars per share) | $ 5.32 |
$6.45 - $9.78 |  |
Stock options, additional disclosures [Abstract] |  |
Outstanding Options, weighted average remaining contractual term (in years) | 7 years 4 months 24 days |
Exercise Price Range, lower range limit (in dollars per share) | $ 6.45 |
Exercise Price Range, upper range limit (in dollars per share) | $ 9.78 |
Number of outstanding options (in shares) | shares | 2,431,132 |
Outstanding Options, weighted average remaining contractual term (in years) | 7 years 4 months 24 days |
Outstanding Options, weighted average exercise price (in dollars per share) | $ 7.30 |
Number of exercisable options (in shares) | shares | 1,614,677 |
Exercisable Options, weighted average exercise price (in dollars per share) | $ 7.23 |
$9.90- $10.99 |  |
Stock options, additional disclosures [Abstract] |  |
Outstanding Options, weighted average remaining contractual term (in years) | 8 years 2 months 12 days |
Exercise Price Range, lower range limit (in dollars per share) | $ 9.90 |
Exercise Price Range, upper range limit (in dollars per share) | $ 10.99 |
Number of outstanding options (in shares) | shares | 106,000 |
Outstanding Options, weighted average remaining contractual term (in years) | 8 years 2 months 12 days |
Outstanding Options, weighted average exercise price (in dollars per share) | $ 10.43 |
Number of exercisable options (in shares) | shares | 35,326 |
Exercisable Options, weighted average exercise price (in dollars per share) | $ 10.43 |

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