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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2015
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 per share amounts):
|  | Number of Options Outstanding |  |  | Weighted Average Exercise Price per Share |
Balances at December 31, 2014 |  |  | 11,323 |  |  | $ | 4.13 |
Granted |  |  | 2,870 |  |  |  | 4.49 |
Forfeited |  |  | (9 | ) |  |  | 4.62 |
Expired |  |  | (2 | ) |  |  | 5.71 |
Exercised |  |  | (214 | ) |  |  | 3.11 |
Balances at March 31, 2015 |  |  | 13,968 |  |  |  | 4.22 |
Recognition of Stock-Based Compensation Expense | Stock-based compensation recognized on the Company’s unaudited condensed consolidated statements of operations for the three months ended March 31, 2015 and 2014, was as follows (in thousands):
|  | Three Months Ended |
|  | March 31, |
|  | 2015 |  |  | 2014 |
Stock-based compensation expense by caption: |  |  |  |  |  |  |  |
Research and development |  | $ | 282 |  |  | $ | 183 |
Selling, general and administrative |  |  | 1,192 |  |  |  | 762 |
Total stock-based compensation expense |  | $ | 1,474 |  |  | $ | 945 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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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