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Stock-Based Awards (Tables) | 12 Months Ended
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Dec. 31, 2012
Stock-Based Awards [Abstract] |
Summary of options activity |
|  | Options |  |  | Weighted- Average Exercise Price |
Outstanding January 1, 2010 |  |  | 21,372,959 |  |  | $ | 0.57 |
Granted |  |  | 860,000 |  |  |  | 2.38 |
Forfeitures or expirations |  |  | (336,868 | ) |  |  | 2.77 |
Exercised |  |  | (452,474 | ) |  |  | 1.15 |
Outstanding at December 31, 2010 |  |  | 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 |
Summary of Stock Options Outstanding |
|  | Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices |  | Number Outstanding at December 31, 2012 |  |  | Weighted- Average Remaining Contractual Life in Years |  |  | Weighted- Average Exercise Price |  |  | Number Exercisable at December 31, 2012 |  |  | Weighted- Average Exercise Price |  |  | Aggregate Intrinsic Value at December 31, 2012 |
$0.03 – $0.45 |  |  | 5,901,953 |  |  |  | 1.5 |  |  | $ | 0.09 |  |  |  | 5,901,953 |  |  | $ | 0.09 |  |  | $ | 35,573 |
$0.70 – $0.97 |  |  | 2,542,500 |  |  |  | 6.1 |  |  |  | 0.70 |  |  |  | 1,773,750 |  |  |  | 0.70 |  |  |  | 9,614 |
$1.07 – $1.80 |  |  | 2,267,439 |  |  |  | 4.0 |  |  |  | 1.07 |  |  |  | 1,474,609 |  |  |  | 1.07 |  |  |  | 7,445 |
$2.03 – $4.03 |  |  | 1,258,299 |  |  |  | 5.3 |  |  |  | 2.22 |  |  |  | 1,163,299 |  |  |  | 2.18 |  |  |  | 4,587 |
$5.05 – $5.26 |  |  | 470,000 |  |  |  | 8.1 |  |  |  | 5.07 |  |  |  | 12,500 |  |  |  | 5.26 |  |  |  | 11 |
$6.36 – $6.82 |  |  | 200,000 |  |  |  | 8.5 |  |  |  | 6.52 |  |  |  | 50,000 |  |  |  | 6.52 |  |  |  | — |
$7.01 – $8.51 |  |  | 120,000 |  |  |  | 8.7 |  |  |  | 7.48 |  |  |  | 30,000 |  |  |  | 7.48 |  |  |  | — |
|  |  | 12,760,191 |  |  |  | 3.7 |  |  | $ | 0.95 |  |  |  | 10,406,111 |  |  | $ | 0.63 |  |  | $ | 57,230 |
Summary of weighted average assumption used to estimate the Fair Value Option Pricing Model |
|  | 2011 |  | 2010
Expected life (years) |  | 5.0 |  | 5.0
Risk free interest rate |  | 0.84% to 2.32% |  | 1.13% to 2.54%
Dividends |  | — |  | —
Volatility |  | 67.00% to 70.62% |  | 71.13% to 76.55%
Summary of Restricted Shares Outstanding |
|  | Restricted Stock Awards |
Unvested balance at January 1, 2010 |  |  | 4,430,123 |
Granted |  |  | 554,011 |
Vested |  |  | (2,772,125 | )
Forfeited |  |  | (53,500 | )
Unvested balance at December 31, 2010 |  |  | 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 |

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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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- Definition Tabular disclosure of the following for fully vested share options (or share units) and share options expected to vest at the date of the latest statement of financial position: the number, weighted-average exercise price (or conversion ratio), aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term of options (or share units) 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 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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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- Definition Tabular disclosure of the number of fully vested share options (or share units) and share options expected to vest at the date of the latest statement of financial position, weighted-average exercise price (or conversion ratio), aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term for both options (or share units) currently outstanding and options (or share units) exercisable (or convertible). + 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 (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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