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Stockholders' Equity
 3 Months Ended
Apr. 04, 2020
Share-based Payment Arrangement [Abstract]  
Stockholders' Equity Stockholders’ Equity
 
Equity Incentive Plans

In May 2015, the Company’s board of directors and stockholders adopted and approved the 2015 Equity Incentive Plan (the “2015 Plan”). The 2015 Plan became effective on June 16, 2015 and serves as the successor to the Amended and Restated 2007 Stock Plan (the “2007 Plan”). The Company ceased granting awards under the 2007 Plan upon the effectiveness of the 2015 Plan. However, any outstanding stock options and restricted stock units (“RSUs”) granted under the 2007 Plan remain subject to the terms of the 2007 Plan. As of April 4, 2020, 30.4 million shares of Class A common stock were reserved and available for future issuance under the 2015 Plan.
Stock Options
 
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.

 Restricted Stock Units
 
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  
 

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  

As of April 4, 2020, the total unrecognized stock-based compensation expense related to unvested stock options and RSUs was $130.5 million, which the Company expects to recognize over an estimated weighted average period of 2.1 years.