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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation | Stock-Based Compensation The Company allocates stock-based compensation expense related to equity plans for employees and non-employee directors among cost of sales, research and development and other engineering expense, selling expense, or general and administrative expense based on the job functions performed by the employees to whom the stock-based compensation is awarded. The Company recognized stock-based compensation expense related to its equity plans for employees of $2.9 million and $3.2 million for the three months ended June 30, 2018 and 2017, respectively and $6.0 million and $11.2 million, respectively for the six months ended June 30, 2018 and 2017, respectively. Stock-based compensation cost capitalized in inventory was immaterial for all periods presented. During the six months ended June 30, 2018, the Company granted 188,942 restricted stock units ("RSUs") to the Company's employees, including officers, and eight non-employee directors at an estimated weighted average fair value of $54.99 per share, based on the closing price (adjusted for certain market factors, and to a lesser extent, the present value of dividends) of the Company's common stock on the grant date. The RSUs granted to the Company's employees may be time-based, performance-based or time- and performance-based. Certain of the performance-based RSUs are granted to officers and key employees, where the number of performance-based awards to be issued is based on the achievement of certain Company performance criteria established in the RSU agreement over a cumulative three year period. These awards cliff vest after three years. In addition, these same officers and key employees also receive time-based RSUs, which vest pursuant to a three-year graded vesting schedule. Time- and performance based RSUs are granted to the Company's employees excluding officers and certain key employees, vest ratably over the four year life of the award, and require the underlying shares of the Company's common stock to be subject to a performance-based adjustment during the first year. As of June 30, 2018, the aggregate unamortized stock compensation expense was approximately $14.6 million, which is entirely attributable to unvested RSUs and is expected to be recognized in expense over a weighted-average period of 2.3 years.

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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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