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Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2014
Stock-based Compensation [Abstract] |
Stock Option Activity | A summary of activity for the year ended December 31, 2014 is as follows:
|  | Options |  |  | Weighted Average Exercise Price |
Balance as of January 1, 2014 |  |  | 8,322,289 |  |  | $ | 4.55 |
Granted |  |  | 3,058,190 |  |  | $ | 1.99 |
Exercised |  |  | (2,667 | ) |  | $ | 2.62 |
Expired |  |  | (396,328 | ) |  | $ | 4.14 |
Cancelled/forfeited |  |  | (1,866,136 | ) |  | $ | 3.45 |
Balance as of December 31, 2014 |  |  | 9,115,348 |  |  | $ | 3.93 |
Stock Options Vested and Expected to Vest |
|  | Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value |
Balance as of December 31, 2014 |  |  | 9,115,348 |  |  | $ | 3.93 |  |  |  | 6.31 |  |  | $ | 584.4 |
Vested and expected to vest at December 31, 2014 |  |  | 9,064,341 |  |  | $ | 3.94 |  |  |  | 6.30 |  |  | $ | 560.47 |
Exercisable at December 31, 2014 |  |  | 6,230,987 |  |  | $ | 4.70 |  |  |  | 5.06 |  |  | $ | — |
Weighted-average Assumptions | The fair value of each option awarded during the year ended December 31, 2014, 2013 and 2012 was estimated on the date of grant using the Black-Scholes-Merton option valuation model based on the following weighted-average assumptions:
|  | Years ended December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Expected term |  | 6.0 years |  |  | 6.0 years |  |  | 5.2 years |
Risk-free interest rate |  |  | 1.86 | % |  |  | 1.12 | % |  |  | 0.83 | %
Volatility |  |  | 77.52 | % |  |  | 75.27 | % |  |  | 75.63 | %
Dividends |  |  | — |  |  |  | — |  |  |  | — |
Resulting weighted average grant date fair value |  | $ | 1.35 |  |  | $ | 1.72 |  |  | $ | 1.96 |
Restricted Stock Awards Activity | A summary of activity for the year ended December 31, 2014 is as follows:
|  | Restricted Stock Awards |  |  | Weighted Average Grant Date Fair Value |
Balance as of January 1, 2014 |  |  | 106,341 |  |  | $ | 3.62 |
Granted |  |  | 115,808 |  |  | $ | 2.50 |
Exercised/Released |  |  | (12,200 | ) |  | $ | 2.80 |
Cancelled/forfeited |  |  | (16,826 | ) |  | $ | 2.51 |
Balance as of December 31, 2014 |  |  | 193,123 |  |  | $ | 3.10 |
Restricted Stock Awards Vested and Expected to Vest |
|  | Restricted Stock Awards |  |  | Weighted Average Grant Date Fair Value |  |  | Weighted Average Remaining Contractual Term (years) |
Balance as of December 31, 2014 |  |  | 193,123 |  |  | $ | 3.10 |  |  |  | 8.32 |
Vested and expected to vest at December 31, 2014 |  |  | 193,123 |  |  | $ | 3.10 |  |  |  | 7.21 |
Exercisable at December 31, 2014 |  |  | 83,641 |  |  | $ | 3.91 |  |  |  | 8.32 |
Compensation Cost Recognized for Stock Options and Restricted Stock Awards | The following summarizes the total compensation cost recognized for the stock options and restricted stock awards in the accompanying financial statements:
|  | Years ended December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Total compensation cost for share-based payment arrangements recognized in the statement of operations (net of tax of $0) |  | $ | 3,101,000 |  |  | $ | 3,608,000 |  |  | $ | 3,904,000 |

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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 significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (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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