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Stock-based Compensation | 6 Months Ended
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Jun. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-based Compensation | Stock-based Compensation. S tock-based compensation expense before income tax expense for the three and six-month periods ended June 30, 2012 and 2011, consisted of the following (in thousands):
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2012 |  | 2011 |  | 2012 |  | 2011
Cost of goods sold | $ | 59 |  |  | $ | 38 |  |  | $ | 141 |  |  | $ | 89 |
Research and development | 35 |  |  | 16 |  |  | 67 |  |  | 29 |
Selling, general, and administrative | 376 |  |  | 257 |  |  | 817 |  |  | 528 |
Stock-based compensation expense before taxes | $ | 470 |  |  | $ | 311 |  |  | $ | 1,025 |  |  | $ | 646 |
The excess income tax benefit created from the exercises of stock options was approximately $162,000 and $166,000 for the three and six-month periods ended June 30, 2012, respectively, as compared to $1.8 million and $2.9 million for the three and six-month periods ended June 30, 2011, respectively. As of June 30, 2012, the total remaining unrecognized compensation cost related to non-vested stock options, net of expected forfeitures, was approximately $5.4 million and is expected to be recognized over a weighted average period of 3.7 years. During the three and six-month periods ended June 30, 2012, we granted 120,000 stock awards. During the three and six-month periods ended June 30, 2011, there were no stock awards. We use the Black-Scholes methodology to value the stock-based compensation expense for options. In applying the Black-Scholes methodology to our outstanding option grants, we used the following assumptions:
| Six Months Ended
| June 30,
| 2012 |  | 2011
Risk-free interest rate | 0.95% |  | —
Expected option life | 6 years |  | —
Expected dividend yield | — |  | —
Expected price volatility | 42.01% |  | —
The average risk-free interest rate is determined using the U.S. Treasury rate in effect as of the date of grant, based on the expected term of the stock option. We determine the expected term of the stock options using the historical exercise behavior of employees. The expected price volatility was determined using a weighted average of daily historical volatility of our stock price over the corresponding expected option life and implied volatility based on recent trends of the daily historical volatility. For options with a vesting period, compensation expense is recognized on a straight-line basis over the service period, which corresponds to the vesting period.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-6 -Paragraph 53 -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 SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65, A240 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 8: 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 + Details
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