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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2018
Stock-Based Compensation |
Stock-Based Compensation | 11. Stock-Based Compensation In fiscal 2009, the stockholders of the Company approved the 2009 Stock Incentive Plan (the “2009 Plan”) and the 2009 Employee Stock Purchase Plan (the “2009 Purchase Plan”). In fiscal 2017, the stockholders of the Company approved amendments to both the 2009 Plan and the 2009 Purchase Plan. These amendments authorized additional shares of common stock for issuance, to comply with changes in applicable law, improve the Company’s corporate governance and to implement other best practices. Stock-based compensation costs are based on the fair values on the date of grant for stock awards and stock options and on the date of enrollment for the employee stock purchase plans. The fair values of stock awards (such as restricted stock awards (RSUs), performance stock units (PSUs) and restricted stock awards (RSAs)) are estimated based on their intrinsic values. The fair values of market stock awards (MSUs) are estimated using a Monte Carlo simulation. The fair values of stock options and employee stock purchase plans are estimated using the Black-Scholes option-pricing model. The following table presents details of stock-based compensation costs recognized in the Condensed Consolidated Statements of Income (in thousands):
|  | Three Months Ended |  | Six Months Ended |
|  | June 30, 2018 |  | July 1, 2017 |  | June 30, 2018 |  | July 1, 2017 |
Cost of revenues |  | $ | 294 |  | $ | 264 |  | $ | 590 |  | $ | 522 |
Research and development |  | 5,669 |  | 5,503 |  | 11,438 |  | 10,750 |
Selling, general and administrative |  | 6,156 |  | 5,399 |  | 12,283 |  | 10,380 |
|  | 12,119 |  | 11,166 |  | 24,311 |  | 21,652 |
Income tax benefit |  | 1,677 |  | 3,175 |  | 6,896 |  | 8,457 |
|  | $ | 10,442 |  | $ | 7,991 |  | $ | 17,415 |  | $ | 13,195 |
The Company had approximately $84.9 million of total unrecognized compensation costs related to granted stock options and awards as of June 30, 2018 that are expected to be recognized over a weighted-average period of approximately 2.2 years. There were no significant stock-based compensation costs capitalized into assets in any of the periods presented.

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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 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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