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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2013
Stock-Based Compensation Expense | The following table presents stock-based compensation expense included in the Company’s consolidated statements of comprehensive income:
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Cost of product revenue |  | $ | 24,059 |  |  | $ | 10,646 |  |  | $ | 47,151 |  |  | $ | 33,420 |
Research and development |  |  | 30,092 |  |  |  | 53,094 |  |  |  | 73,814 |  |  |  | 169,919 |
Selling, general and administrative |  |  | 151,621 |  |  |  | 224,539 |  |  |  | 647,569 |  |  |  | 540,609 |
Total |  | $ | 205,772 |  |  | $ | 288,279 |  |  | $ | 768,534 |  |  | $ | 743,948 |
Summary of Option Activity | Information regarding option activity for the nine months ended September 30, 2013 under the Plans is summarized below:
|  | Options Outstanding |  |  | Weighted- Average Exercise Price Per Share |  |  | Weighted- Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value |
Options outstanding at January 1, 2013 |  |  | 2,315,090 |  |  | $ | 4.20 |  |  |  |  |  |  |  |  |
Granted |  |  | 541,052 |  |  |  | 6.97 |  |  |  |  |  |  |  |  |
Exercised |  |  | (884,954 | ) |  |  | 4.36 |  |  |  |  |  |  |  |  |
Forfeited/Cancelled |  |  | (300,500 | ) |  |  | 5.03 |  |  |  |  |  |  |  |  |
Options outstanding at September 30, 2013 |  |  | 1,670,688 |  |  | $ | 4.87 |  |  |  | 6.91 |  |  | $ | 10,394,325 |
Options exercisable at September 30, 2013 |  |  | 866,136 |  |  | $ | 4.19 |  |  |  | 5.16 |  |  | $ | 5,972,968 |
Vested and expected to vest at September 30, 2013 (1) |  |  | 1,576,516 |  |  | $ | 4.77 |  |  |  | 6.82 |  |  | $ | 9,970,772 |
(1) | This represents the number of vested options as of September 30, 2013 plus the number of unvested options expected to vest as of September 30, 2013 based on the unvested outstanding options at September 30, 2013 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.

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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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