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Stock-Based Awards (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Unrecognized Stock-Based Compensation Expense and Average Remaining Vesting Period | A summary of unrecognized stock-based compensation expense and average remaining vesting period is as follows:
|  | December 31, 2017 |
|  | Unrecognized Stock- Based Compensation |  |  | Average Remaining Vesting Period |
Employees and directors |  | $ | 16,715 |  |  |  | 1.70 |
Summary of Option Activity | A summary of option activity is as follows:
|  | Options |  |  | Weighted-Average Exercise Price |
Outstanding January 1, 2015 |  |  | 5,330,070 |  |  | $ | 1.61 |
Granted |  |  | — |  |  |  | — |
Forfeitures/expirations |  |  | — |  |  |  | — |
Exercised |  |  | (3,785,473 | ) |  |  | 1.19 |
Outstanding at December 31, 2015 |  |  | 1,544,597 |  |  | $ | 2.62 |
Granted |  |  | — |  |  |  | — |
Forfeitures/expirations |  |  | — |  |  |  | — |
Exercised |  |  | (176,350 | ) |  |  | 1.11 |
Outstanding at December 31, 2016 |  |  | 1,368,247 |  |  | $ | 2.82 |
|  | Options |  |  | Weighted-Average Exercise Price |
Granted |  |  | — |  |  |  | — |
Forfeitures/expirations |  |  | — |  |  |  | — |
Exercised |  |  | (209,419 | ) |  |  | 3.17 |
Outstanding at December 31, 2017(1) |  |  | 1,158,828 |  |  | $ | 2.75 |
(1) | Expire on dates ranging from August 24, 2018 to November 15, 2021.
Summary of Information on Stock Options Outstanding | The following table summarizes information on stock options outstanding at December 31, 2017:
|  | Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices |  | Shares |  |  | Weighted- Average Remaining Life (Years) |  |  | Weighted- Average Exercise Price |  |  | Shares |  |  | Weighted- Average Remaining Life (Years) |  |  | Weighted- Average Exercise Price |
$0.70 – $0.70 |  |  | 415,000 |  |  |  | 1.1 |  |  | $ | 0.70 |  |  |  | 415,000 |  |  |  | 1.1 |  |  | $ | 0.70 |
$1.07 – $1.07 |  |  | 50,865 |  |  |  | 0.3 |  |  |  | 1.07 |  |  |  | 50,865 |  |  |  | 0.3 |  |  |  | 1.07 |
$2.15 – $2.26 |  |  | 312,426 |  |  |  | 1.5 |  |  |  | 2.21 |  |  |  | 312,426 |  |  |  | 1.5 |  |  |  | 2.21 |
$5.05 – $5.05 |  |  | 250,000 |  |  |  | 3.1 |  |  |  | 5.05 |  |  |  | 250,000 |  |  |  | 3.1 |  |  |  | 5.05 |
$6.36 – $6.82 |  |  | 73,037 |  |  |  | 3.4 |  |  |  | 6.46 |  |  |  | 73,037 |  |  |  | 3.4 |  |  |  | 6.46 |
$7.01 – $8.51 |  |  | 57,500 |  |  |  | 3.8 |  |  |  | 7.32 |  |  |  | 57,500 |  |  |  | 3.8 |  |  |  | 7.32 |
|  |  | 1,158,828 |  |  |  | 1.9 |  |  | $ | 2.75 |  |  |  | 1,158,828 |  |  |  | 1.9 |  |  | $ | 2.75 |
Summary of Restricted Stock Activity | A summary of restricted stock activity is as follows:
|  | Restricted Stock Awards |  |  | Restricted Stock Units |
|  | Shares |  |  | Weighted Average Grant Date Fair Value |  |  | Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested Balance at January 1, 2015 |  |  | 1,513,939 |  |  | $ | 11.22 |  |  |  | — |  |  | $ | — |
Granted |  |  | 886,413 |  |  |  | 19.72 |  |  |  | — |  |  |  | — |
Vested |  |  | (753,917 | ) |  |  | 10.05 |  |  |  | — |  |  |  | — |
Forfeited |  |  | (25,709 | ) |  |  | 17.30 |  |  |  | — |  |  |  | — |
Unvested Balance at December 31, 2015 |  |  | 1,620,726 |  |  | $ | 16.32 |  |  |  | — |  |  | $ | — |
Granted |  |  | 1,687,553 |  |  |  | 11.19 |  |  |  | — |  |  |  | — |
Vested |  |  | (846,386 | ) |  |  | 13.98 |  |  |  | — |  |  |  | — |
Forfeited |  |  | (25,439 | ) |  |  | 16.17 |  |  |  | — |  |  |  | — |
Unvested Balance at December 31, 2016 |  |  | 2,436,454 |  |  | $ | 13.58 |  |  |  | — |  |  | $ | — |
Granted |  |  | 1,068,550 |  |  |  | 10.51 |  |  |  | 7,231 |  |  |  | 10.49 |
Vested |  |  | (1,641,870 | ) |  |  | 13.64 |  |  |  | — |  |  |  | — |
Forfeited |  |  | (46,468 | ) |  |  | 12.36 |  |  |  | (1,553 | ) |  |  | 10.83 |
Unvested Balance at December 31, 2017 |  |  | 1,816,666 |  |  | $ | 11.75 |  |  |  | 5,678 |  |  | $ | 10.40 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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=96867065&loc=d3e5070-113901 + Details
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