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Stock-Based Compensation | 3 Months Ended
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Apr. 03, 2020
Share-based Payment Arrangement [Abstract] |
STOCK-BASED COMPENSATION | STOCK-BASED COMPENSATION We allocated the stock-based compensation expense for our equity incentive plans and our 2000 Employee Stock Purchase Plan (ESPP) as follows (in thousands):
| Three Months Ended March 31,
| 2020 |  | 2019
Research and development | $ | 5,086 |  |  | $ | 4,306 |
Selling, general and administrative | 8,896 |  |  | 8,223 |
Total stock-based compensation | $ | 13,982 |  |  | $ | 12,529 |
During the three months ended March 31, 2020, we granted 271,370 stock options with a weighted average exercise price of $18.84 per share and a weighted average grant date fair value of $8.27 per share. As of March 31, 2020, there were 19,750,438 stock options outstanding and there was $30.3 million of unrecognized compensation expense related to our unvested stock options. During the three months ended March 31, 2020, we granted 595,685 restricted stock units (RSUs) with a weighted average grant date fair value of $20.87 per share. As of March 31, 2020, there were 9,104,132 RSUs outstanding and there was $160.0 million of unrecognized compensation expense related to our unvested RSUs. Stock options and RSUs granted during the three months ended March 31, 2020 have vesting conditions and contractual lives of a similar nature to those described in “Note 8. Employee Benefit Plans” of the Notes to Consolidated Financial Statements included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2019.

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