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Stock Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs | Stock-based compensation expense before income tax expense for the three-month periods ended March 31, 2017 and 2016, consisted of the following (in thousands):
| Three Months Ended March 31,
| 2017 |  | 2016
Cost of goods sold | $ | 96 |  |  | $ | 123 |
Research and development | 52 |  |  | 42 |
Selling, general, and administrative | 429 |  |  | 459 |
Stock-based compensation expense before taxes | $ | 577 |  |  | $ | 624 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | In applying the Black-Scholes methodology to the options granted during the three-month period ended March 31, 2016, the fair value of our stock-based awards granted was estimated using the following assumptions for the periods indicated below:
|  | Three months ended
|  | March 31, 2016
Risk-free interest rate |  | 1.4%
Expected option life |  | 5.0 years
Expected dividend yield |  | —%
Expected price volatility |  | 37.06%

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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 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: 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 3: 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 + 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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