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Share-based compensation | 3 Months Ended
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Mar. 31, 2019
Stock Plans |
Stock Plans | Note 8 — Share-based compensation Restricted share awards are issued to employees that are subject to specified restrictions and a risk of forfeiture. The restrictions typically lapse over one to five years and may entitle holders to dividends and voting rights. Other types of share-based compensation include performance share awards, performance share units, and restricted share units (collectively with restricted share awards, “restricted shares”), as well as options to purchase common stock. Share-based compensation expense was recognized in the following line items in the Consolidated Statements of Operations for the three months ended March 31, 2019 and 2018:
|  | Three months ended March 31, |
|  | 2019 |  | 2018 |
|  | (in thousands) |
Cost of sales |  | $ | 470 |  | $ | 554 |
Research and development |  |  | 792 |  |  | 954 |
Selling, general, and administrative |  |  | 1,895 |  |  | 2,857 |
Restructuring |  |  | — |  |  | 172 |
Total |  | $ | 3,157 |  | $ | 4,537 |
For the three months ended March 31, 2019, equity activity related to stock options was as follows:
|  |  |  | Weighted
|  | Number of |  | Average
|  | Shares |  | Exercise Price
|  | (in thousands) |  |  |
Balance - December 31, 2018 |  | 1,222 |  |  | 34.80
Expired or forfeited |  | (33) |  |  | 33.82
Balance - March 31, 2019 |  | 1,189 |  |  | 34.83
For the three months ended March 31, 2019, equity activity related to non-vested restricted shares and performance shares was as follows:
|  |  |  | Weighted
|  |  |  | Average
|  | Number of |  | Grant Date
|  | Shares |  | Fair Value
|  | (in thousands) |  |  |
Balance - December 31, 2018 |  | 2,218 |  |  | 20.74
Granted |  | 974 |  |  | 11.32
Performance award adjustments |  | (9) |  |  | 32.67
Vested |  | (156) |  |  | 21.71
Forfeited |  | (89) |  |  | 21.84
Balance - March 31, 2019 |  | 2,938 |  |  | 17.50

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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