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Stock-Based Compensation

3 Months Ended

Apr. 03, 2020

Share-based Payment Arrangement [Abstract]

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.