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Stock-Based Compensation and Employee Benefit Plan (Tables)
 6 Months Ended
Jun. 30, 2020
Compensation Related Costs [Abstract]  
Weighted-Average Valuation Assumptions
We used the following weighted-average assumptions in applying the Black-Scholes valuation model for determination of options:
 Three Months Ended
June 30,		Six Months Ended
June 30,
 2020201920202019
   
Risk-free interest rate0.6%
2.4%- 2.5%
0.6%
2.4% - 2.6%
Expected term (years)6.6
6.4 - 6.7
6.6
6.4 - 6.7
Expected dividend yield————
Expected volatility
71.0%
47.5%
71.0%
47.5% - 50.2%
Employee and Non-Employee Stock-Based Compensation Expense
The following table summarizes the components of stock-based compensation expense in the condensed consolidated statements of operations (in thousands):
 Three Months Ended
June 30,		Six Months Ended
June 30,
 2020201920202019
As RestatedAs Restated
   
Cost of revenue$4,736  $10,538  $10,243  $28,850  
Research and development4,714  12,218  10,810  26,448  
Sales and marketing2,234  8,935  6,124  20,447  
General and administrative6,947  19,673  14,473  43,441  
$18,631  $51,364  $41,650  $119,186  
Stock Option and RSU Activity
The following table summarizes the stock option activity under our stock plans during the reporting period:
 Outstanding Options
 Number of
Shares		Weighted
Average
Exercise
Price		Remaining
Contractual
Life (Years)		Aggregate
Intrinsic
Value
   (in thousands)
December 31, 201917,837,316  $20.76  6.94$14,964  
Granted200,000  7.30  
Exercised(170,873) 5.90  
Cancelled(694,838) 22.46  
Balances at June 30, 202017,171,605  20.69  6.4626,824  
Vested and expected to vest at Current period end16,555,245  21.08  6.3724,325  
Exercisable at Current period end9,515,698  28.48  4.67384  
The following table presents the stock activity and the total number of RSUs available for grant under our stock plans as of June 30, 2020:
 Plan Shares Available
for Grant
  
Balances at December 31, 201917,233,144  
Added to plan6,654,552  
Granted(1,414,942) 
Cancelled992,262  
Expired(675,276) 
Balances at June 30, 202022,789,740  
RSU Activity and Related Information
A summary of our RSUs activity and related information is as follows:
Number of
Awards
Outstanding		Weighted
Average Grant
Date Fair
Value
Unvested Balance at December 31, 201910,112,266  $17.29  
Granted1,214,942  8.75  
Vested(3,320,153) 19.06  
Forfeited(298,951) 15.50  
Balances at June 30, 20207,708,104  15.26