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Stockholders' Equity (Tables)
 3 Months Ended
Apr. 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 (220) $2.08  
Forfeited or canceled (6) $7.37  
Balance—April 4, 2020
12,645  $3.53  $40,349  
Stock options vested and expected to vest—April 4, 2020
12,645  $3.53  $40,349  
Stock options exercisable—April 4, 2020
12,645  $3.53  $40,349  
 
(1) The aggregate intrinsic values of stock options outstanding, exercisable, vested and expected to vest as of April 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 $6.40 as of April 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  
Granted8,799  $6.41  
Vested(2,609) $6.48  
Forfeited or canceled(399) $5.72  
Unvested balance—April 4, 2020
24,723  $5.86  
Schedule of stock-based compensation expense
Total stock-based compensation expense recognized was as follows (in thousands):
 
 
Three Months Ended
 
April 4, 2020
March 30, 2019
Cost of revenue$2,179  $1,430  
Research and development11,119  11,988  
Sales and marketing2,775  3,138  
General and administrative3,654  3,988  
Total stock-based compensation expense$19,727  $20,544