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Stockholders' Equity (Tables)
6 Months Ended
Jul. 04, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of stock option activity
Stock option activity under the equity incentive plans was as follows (in thousands, except per share amounts):
 Stock Options Outstanding
 Number of
Shares Subject
to
Stock Options
Weighted–
Average
Exercise
Price
Aggregate
Intrinsic
Value (1)
Balance—December 31, 2019
12,871  $3.51  
Granted —  $—  
Exercised (857) $1.17  
Forfeited or canceled (87) $6.67  
Balance—July 4, 2020
11,927  $3.65  $35,551  
Stock options vested and expected to vest—July 4, 2020
11,927  $3.65  $35,551  
Stock options exercisable—July 4, 2020
11,927  $3.65  $35,551  
 
(1) The aggregate intrinsic values of stock options outstanding, exercisable, vested and expected to vest as of July 4, 2020 were calculated as the difference between the exercise price of the stock options and the fair value of the Class A common stock of $6.29 as of July 4, 2020.
Schedule of restricted stock unit activity
RSU activity under the equity incentive plans was as follows (in thousands, except per share amounts):
RSUs
Outstanding
Weighted-
Average
Grant Date
Fair Value
Unvested balance—December 31, 2019
18,932  $5.68  
Granted9,661  $6.41  
Vested(5,755) $6.26  
Forfeited or canceled(601) $5.81  
Unvested balance—July 4, 2020
22,237  $5.85  
Schedule of stock-based compensation expense
Total stock-based compensation expense recognized was as follows (in thousands):
 
 Three Months Ended
Six Months Ended
 
July 4, 2020
June 29, 2019
July 4, 2020
June 29, 2019
Cost of revenue$2,033  $1,521  $4,212  $2,951  
Research and development11,442  11,892  22,561  23,880  
Sales and marketing2,899  3,175  5,674  6,313  
General and administrative3,396  3,959  7,050  7,947  
Total stock-based compensation expense$19,770  $20,547  $39,497  $41,091