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Employee Stock Purchase Plan, Stock Options and Warrants (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs | The stock-based compensation expense before income tax expense for the years ended December 31, 2017, 2016 and 2015, consisted of the following (in thousands):
| 2017 |  | 2016 |  | 2015
Cost of goods sold | $ | 632 |  |  | $ | 472 |  |  | $ | 398 |
Research and development | 376 |  |  | 184 |  |  | 122 |
Selling, general, and administrative | 3,067 |  |  | 1,850 |  |  | 1,723 |
Stock-based compensation expense before taxes | $ | 4,075 |  |  | $ | 2,506 |  |  | $ | 2,243 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | In applying the Black-Scholes methodology to the option grants, the fair value of our stock-based awards granted were estimated using the following assumptions for the periods indicated below:
| 2017 |  | 2016 |  | 2015
Risk-free interest rate | 1.77% | - | 1.83% |  | 1.15% | - | 1.40% |  | 1.53% | - | 1.66%
Expected option life | 5.0 years |  | 5.0 years |  | 5.0 years
Expected dividend yield | —% |  | —% |  | —%
Expected price volatility | 33.81% | - | 34.07% |  | 34.28% | - | 37.06% |  | 33.72% | - | 35.11%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable | The table below presents information related to stock option activity for the years ended December 31, 2017, 2016 and 2015 (in thousands):
| 2017 |  | 2016 |  | 2015
Total intrinsic value of stock options exercised | $ | 9,264 |  |  | $ | 3,648 |  |  | $ | 7,548 |
Cash received from stock option exercises | 5,552 |  |  | 4,577 |  |  | 6,227 |
Excess tax benefit from the exercise of stock options | 2,264 |  |  | 669 |  |  | 2,124 |
Schedule of Share-based Compensation, Stock Options, Activity | Changes in stock options for the year ended December 31, 2017, consisted of the following (shares and intrinsic value in thousands):
| Number of Shares |  | Weighted Average Exercise Price |  | Remaining Contractual Term (in years) |  | Intrinsic Value
Beginning balance | 2,817 |  |  | $ | 15.32 |  |  |  |  |  |
Granted | 1,297 |  |  | 29.31 |  |  |  |  |  |
Exercised | (404 | ) |  | 14.02 |  |  |  |  |  |
Forfeited/expired | (87 | ) |  | 18.79 |  |  |  |  |  |
Outstanding at December 31 | 3,623 |  |  | 20.40 |  |  | 4.57 years |  | $ | 82,615 |
Exercisable | 1,110 |  |  | 14.35 |  |  | 2.55 years |  | 32,019 |
Ending vested and expected to vest | 3,484 |  |  | 20.23 |  |  | 4.52 years |  | 80,052 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range | The following table summarizes information about stock options outstanding at December 31, 2017 (shares in thousands):
|  |  |  | Options Outstanding |  | Options Exercisable
Range of Exercise |  | Number Outstanding |  | Weighted Average Remaining Contractual Life (in years) |  | Weighted Average Exercise Price |  | Number Exercisable |  | Weighted Average Exercise Price
$9.95 | - | $13.75 |  | 925 |  | 2.17 years |  | $ | 12.65 |  |  | 713 |  | $ | 12.84 |
$13.77 | - | $17.27 |  | 991 |  | 4.38 years |  | $ | 16.18 |  |  | 294 |  | $ | 15.96 |
$18.80 | - | $22.00 |  | 425 |  | 5.00 years |  | $ | 20.14 |  |  | 103 |  | $ | 20.18 |
$28.20 | - | $38.35 |  | 1,282 |  | 6.30 years |  | $ | 29.33 |  |  | 0 |  | $ | — |
$9.95 | - | $38.35 |  | 3,623 |  |  |  |  |  |  | 1,110 |  |  |

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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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