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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2014
Activity Under Equity Incentive Plans Related to Stock Options | Activity under the Company’s equity incentive plans related to stock options is set forth below (in thousands except weighted average exercise price):
|  | Number of Options Outstanding |  |  | Weighted Average Exercise Price per Share |
Balances at December 31, 2013 |  |  | 10,405 |  |  | $ | 3.46 |
Granted |  |  | 2,783 |  |  |  | 5.90 |
Forfeited |  |  | (233 | ) |  |  | 4.31 |
Expired |  |  | (114 | ) |  |  | 8.64 |
Exercised |  |  | (1,518 | ) |  |  | 2.44 |
Balances at December 31, 2014 |  |  | 11,323 |  |  |  | 4.13 |
Information Regarding Stock Options Outstanding Stock Options Vested and Expected to Vest and Stock Options Exercisable | Information regarding the Company’s stock options outstanding, stock options vested and expected to vest, and stock options exercisable at December 31, 2014, was as follows (in thousands except weighted average exercise price and contractual term):
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value |
Balances at December 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options outstanding |  |  | 11,323 |  |  | $ | 4.13 |  |  |  | 6.8 |  |  | $ | 25,517 |
Stock options vested and expected to vest |  |  | 10,920 |  |  | $ | 4.08 |  |  |  | 6.7 |  |  | $ | 25,174 |
Stock options exercisable |  |  | 7,006 |  |  | $ | 3.70 |  |  |  | 5.7 |  |  | $ | 19,324 |
Recognition of Stock-Based Compensation Expense | Stock-based compensation expense recognized on the Company’s consolidated statements of operations for the years ended December 31, 2014, 2013 and 2012, was as follows (in thousands):
|  | Year Ended December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Stock-based compensation expense by caption: |  |  |  |  |  |  |  |  |  |  |  |
Research and development |  | $ | 998 |  |  | $ | 482 |  |  | $ | 554 |
Selling, general and administrative |  |  | 4,155 |  |  |  | 2,786 |  |  |  | 1,987 |
Total stock-based compensation expense |  | $ | 5,153 |  |  | $ | 3,268 |  |  | $ | 2,541 |
Weighted Average Assumptions Used to Value Stock-Based Awards | The weighted average assumptions used to value the Company’s stock-based awards for the years ended December 31, 2014, 2013 and 2012, was as follows:
|  | Year Ended December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Stock Options: |  |  |  |  |  |  |  |  |  |  |  |
Expected term (in years) |  |  | 5.71 |  |  |  | 5.59 |  |  |  | 5.54 |
Estimated volatility |  |  | 61 | % |  |  | 60 | % |  |  | 67 | %
Risk-free interest rate |  |  | 1.73 | % |  |  | 0.87 | % |  |  | 1.03 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Employee Stock Purchase Plan Rights: |  |  |  |  |  |  |  |  |  |  |  |
Expected term (in years) |  |  | 0.76 |  |  |  | 0.50 |  |  |  | 0.50 |
Estimated volatility |  |  | 52 | % |  |  | 39 | % |  |  | 101 | %
Risk-free interest rate |  |  | 0.10 | % |  |  | 0.10 | % |  |  | 0.14 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %

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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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