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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2013
Stock-Based Compensation |
Summary of the option activity under the Company's Amended and Restated 2000 Stock Option and Equity Incentive Plan (Amended 2000 Plan) and 2010 Equity Incentive Plan (2010 Plan), referred to collectively as the "Plans," | A summary of the option activity under the Company’s Amended and Restated 2000 Stock Option and Equity Incentive Plan (Amended 2000 Plan) and 2010 Equity Incentive Plan (2010 Plan), referred to collectively as the “Plans,” is presented below (in thousands, except exercise price):
|  |  |  | Options Outstanding |
|  | Available for Grant |  | Number of Shares |  | Weighted Average Exercise Prices |
Balance at December 31, 2012 |  | 1,265 |  | 6,872 |  | $ | 4.05 |
Additional shares authorized under the 2010 Plan |  | 500 |  | — |  | — |
Options granted |  | (176 | ) | 176 |  | $ | 3.48 |
Options cancelled |  | 471 |  | (471 | ) | $ | 5.48 |
Options exercised |  | — |  | (169 | ) | $ | 2.80 |
Options expired |  | (378 | ) | — |  | 5.78 |
Balance at March 31, 2013 |  | 1,682 |  | 6,408 |  | $ | 3.97 |
Options granted |  | (1,140 | ) | 1,140 |  | $ | 4.46 |
Restricted stock units granted |  | (35 | ) | — |  | $ | — |
Options cancelled |  | 113 |  | (113 | ) | $ | 7.04 |
Options exercised |  | — |  | (69 | ) | $ | 3.34 |
Options expired |  | (91 | ) | — |  | 7.85 |
Balance at June 30, 2013 |  | 529 |  | 7,366 |  | $ | 3.98 |
Summary of the inducement grant option activity | A summary of the inducement grant option activity is presented below (in thousands, except exercise price):
|  | Options Outstanding |
|  | Number of Shares |  | Weighted Average Exercise Prices |
Balance at December 31, 2012 |  | 3,358 |  | $ | 4.29 |
Granted |  | 151 |  | $ | 4.21 |
Cancelled |  | (1 | ) | $ | 1.50 |
Exercised |  | (94 | ) | $ | 1.55 |
Balance at March 31, 2013 |  | 3,414 |  | $ | 4.37 |
Exercised |  | (31 | ) | $ | 1.54 |
Balance at June 30, 2013 |  | 3,383 |  | $ | 4.39 |
Summary of restricted stock unit activity under the Plans | A summary of restricted stock unit activity under the Plans is presented below (in thousands, except fair value):
|  | Number of Shares |  | Weighted Average Grant-Date Fair Value |
Non-vested shares at March 31, 2013 |  | — |  | $ | — |
Restricted stock units granted |  | 35 |  | $ | 4.46 |
Non-vested shares at June 30, 2013 |  | 35 |  | $ | 4.46 |
Summary of significant ranges of outstanding and exercisable options, excluding restricted stock award and restricted stock unit activity | The following table summarizes significant ranges of outstanding and exercisable options as of June 30, 2013 (in thousands, except contractual life and exercise price):
|  | Options Outstanding |  | Options Exercisable |
Range of Exercise Price |  | Number Outstanding |  | Weighted Average Remaining Contractual Life (in Years) |  | Weighted Average Exercise Price |  | Aggregate Intrinsic value |  | Number Exercisable |  | Weighted Average Remaining Contractual Life (in Years) |  | Weighted Average Exercise Price |  | Aggregate Intrinsic value |
$1.50 - $3.23 |  | 3,169 |  | 3.63 |  | $ | 2.56 |  | $ | 4,615 |  | 1,746 |  | 2.73 |  | $ | 2.14 |  | $ | 3,290 |
$3.24 - $4.35 |  | 2,754 |  | 3.58 |  | $ | 3.85 |  | 610 |  | 1,686 |  | 2.96 |  | $ | 3.91 |  | 316 |
$4.36 - $5.61 |  | 3,622 |  | 4.29 |  | $ | 4.93 |  | — |  | 2,305 |  | 1.76 |  | $ | 5.18 |  | — |
$5.62 - $10.00 |  | 1,204 |  | 2.65 |  | $ | 6.45 |  | — |  | 862 |  | 2.19 |  | $ | 6.62 |  | — |
|  | 10,749 |  | 3.73 |  | $ | 4.12 |  | $ | 5,225 |  | 6,599 |  | 2.38 |  | $ | 4.24 |  | $ | 3,606 |
Schedule of assumptions used in estimation of fair value of the share-based payment awards on the grant date |
|  | Three Months Ended June 30, |  | Six Months Ended June 30, |
Employee stock options: |  | 2013 |  | 2012 |  | 2013 |  | 2012 |
Risk-free interest rate |  | 0.5% - 0.8% |  | 0.6% |  | 0.5% – 0.8% |  | 0.6% – 0.8% |
Volatility |  | 58.0% – 58.3% |  | 66.3% – 66.8% |  | 58.0% – 59.1% |  | 66.3% – 66.8% |
Expected life (years) |  | 4.0 |  | 4.0 |  | 4.0 |  | 4.0 |
Dividend yield |  | 0% |  | 0% |  | 0% |  | 0% |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(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 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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