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Stock-Based Awards (Tables) | 12 Months Ended
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Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Options Activity | A summary of option activity is as follows:
|  | Options |  |  | Weighted- Average Exercise Price |
Outstanding January 1, 2011 |  |  | 21,443,617 |  |  | $ | 0.60 |
Granted |  |  | 825,000 |  |  |  | 5.80 |
Forfeitures or expirations |  |  | (135,316 | ) |  |  | 2.04 |
Exercised |  |  | (1,280,687 | ) |  |  | 0.64 |
Outstanding at December 31, 2011 |  |  | 20,852,614 |  |  | $ | 0.79 |
Granted |  |  | — |  |  |  | 0.00 |
Forfeitures or expirations |  |  | (73,907 | ) |  |  | 1.75 |
Exercised |  |  | (8,018,516 | ) |  |  | 0.58 |
Outstanding at December 31, 2012 |  |  | 12,760,191 |  |  | $ | 0.95 |
Granted |  |  | — |  |  |  | 0.00 |
Forfeitures or expirations |  |  | (40,000 | ) |  |  | 4.11 |
Exercised |  |  | (4,875,500 | ) |  |  | 0.38 |
Outstanding at December 31, 2013 |  |  | 7,844,691 |  |  | $ | 1.29 |
Summary of Stock Options Outstanding | The following table summarizes information on stock options outstanding at December 31, 2013:
|  | Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices |  | Number Outstanding at December 31, 2013 |  |  | Weighted- Average Remaining Contractual Life in Years |  |  | Weighted- Average Exercise Price |  |  | Number Exercisable at December 31, 2013 |  |  | Weighted- Average Exercise Price |  |  | Aggregate Intrinsic Value at December 31, 2013 |
$0.03 – $0.16 |  |  | 1,701,953 |  |  |  | 0.6 |  |  | $ | 0.10 |  |  |  | 1,701,953 |  |  | $ | 0.10 |  |  | $ | 29,967 |
$0.70 – $0.70 |  |  | 2,525,000 |  |  |  | 5.1 |  |  |  | 0.70 |  |  |  | 2,375,000 |  |  |  | 0.70 |  |  |  | 40,399 |
$1.07 – $1.28 |  |  | 1,935,689 |  |  |  | 2.9 |  |  |  | 1.07 |  |  |  | 1,935,689 |  |  |  | 1.07 |  |  |  | 32,208 |
$2.03 – $4.03 |  |  | 1,017,049 |  |  |  | 4.5 |  |  |  | 2.22 |  |  |  | 978,299 |  |  |  | 2.20 |  |  |  | 15,178 |
$5.05 – $5.05 |  |  | 400,000 |  |  |  | 7.1 |  |  |  | 5.05 |  |  |  | 250,000 |  |  |  | 5.05 |  |  |  | 3,165 |
$6.36 – $6.82 |  |  | 170,000 |  |  |  | 7.4 |  |  |  | 6.52 |  |  |  | 70,000 |  |  |  | 6.52 |  |  |  | 783 |
$7.01 – $8.51 |  |  | 95,000 |  |  |  | 7.7 |  |  |  | 7.50 |  |  |  | 35,000 |  |  |  | 7.54 |  |  |  | 356 |
|  |  | 7,844,691 |  |  |  | 3.7 |  |  | $ | 1.29 |  |  |  | 7,345,941 |  |  | $ | 1.09 |  |  | $ | 122,056 |
Summary of Weighted Average Assumption Used to Estimate Fair Value Option Pricing Model | The estimated weighted-average fair value for options granted in 2011 was $3.31.
|  | 2011
Expected life (years) |  | 5.0
Risk free interest rate |  | 0.84% to 2.32%
Dividends |  | —
Volatility |  | 67.00% to 70.62%
Summary of Restricted Shares Outstanding | The following table summarizes information about restricted shares outstanding for the years ended December 31, 2013, 2012 and 2011:
|  | Restricted Stock Awards |
Unvested balance at January 1, 2011 |  |  | 2,158,509 |
Granted |  |  | 561,526 |
Vested |  |  | (1,382,376 | )
Forfeited |  |  | (26,288 | )
Unvested balance at December 31, 2011 |  |  | 1,311,371 |
Granted |  |  | 1,209,114 |
Vested |  |  | (1,209,121 | )
Forfeited |  |  | (30,220 | )
Unvested balance at December 31, 2012 |  |  | 1,281,144 |
Granted |  |  | 981,810 |
Vested |  |  | (358,334 | )
Forfeited |  |  | (7,743 | )
Unvested balance at December 31, 2013 |  |  | 1,896,877 |
Summary of Stock-Based Compensation Expense | The following table summarizes the Company’s stock-based compensation expense:
|  | For the Year Ended December 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Employees and directors option awards |  | $ | 381 |  |  | $ | 1,436 |  |  | $ | 2,402 |
Employees and directors restricted stock awards |  |  | 6,078 |  |  |  | 3,814 |  |  |  | 2,041 |
Nonemployee consultants and special advisers restricted stock awards |  |  | — |  |  |  | 2,187 |  |  |  | 2,698 |
Total |  | $ | 6,459 |  |  | $ | 7,437 |  |  | $ | 7,141 |
Summary of Unrecognized Stock-Based Compensation Expense and Remaining Vesting Period | The following table summarizes the Company’s unrecognized stock-based compensation expense and remaining vesting period as of December 31, 2013:
|  | Unrecognized Stock-Based Compensation |  |  | Average Remaining Vesting Period |
Employees and directors option awards |  | $ | 902 |  |  |  | 1.96 |
Employees and directors restricted stock awards |  | $ | 8,308 |  |  |  | 1.75 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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