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Stock-Based Compensation Expense (Tables) | 9 Months Ended
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Sep. 30, 2018
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 and nine months ended September 30, 2018 and 2017, consisted of the following (in thousands):
| Three Months Ended September 30, |  |  |  | Nine Months Ended September 30, |  |
| 2018 |  | 2017 |  | 2018 |  | 2017
Cost of sales | $ | 241 |  | $ | 189 |  | $ | 657 |  | $ | 453
Research and development | 141 |  | 110 |  | 412 |  | 262
Selling, general and administrative | 1,291 |  | 893 |  | 3,425 |  | 2,168
Stock-based compensation expense before taxes | $ | 1,673 |  | $ | 1,192 |  | $ | 4,494 |  | $ | 2,883
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 was estimated using the following assumptions for the periods indicated below:
| Nine Months Ended September 30, |  |
| 2018 |  | 2017
Risk-free interest rate | 2.63% - 2.77% |  | 1.77% - 1.83%
Expected option life | 5.0 years |  | 5.0 years
Expected dividend yield | — |  | —
Expected price volatility | 34.06% - 34.32% |  | 33.81% - 34.07%

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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