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Stock-Based Compensation (Tables)
 6 Months Ended
Jul. 02, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Allocated Employee Stock-Based Compensation Expense
We allocated the stock-based compensation expense for our equity incentive plans and our Employee Stock Purchase Plan (ESPP) as follows (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
Research and development$13,667 $6,112 $26,063 $11,198 
Selling, general and administrative14,368 10,042 36,625 18,938 
Total stock-based compensation expense$28,035 $16,154 $62,688 $30,136 
Stock-based compensation for each type of award under our equity incentive plans and ESPP were as follows (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
Stock options$5,902 $5,301 $10,596 $10,295 
Restricted stock units15,412 8,599 27,081 16,396 
Performance stock units4,698 1,429 22,645 1,925 
ESPP2,023 825 2,366 1,520 
Total stock-based compensation expense$28,035 $16,154 $62,688 $30,136 
Schedule of Share-Based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions
A Monte Carlo simulation model was used to determine the grant date fair value of $24.54 for the 2021 PSUs based on the following assumptions:
Fair value of the Company’s common stock on grant date
$21.31 
Expected volatility
49 %
Risk-free interest rate
0.29 %
Dividend yield
— %