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STOCK-BASED COMPENSATION (Tables)
12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Stock-based Compensation Recorded in Consolidated Statements of Operations and Comprehensive Loss
Total stock-based compensation recorded in the consolidated statements of operations and comprehensive loss during the years ended December 31, 2021 and 2020 consisted of the following:
 
    
Years Ended
December 31,
 
    
2021
    
2020
 
Cost of revenues
   $ 10,996      $ 1,400  
Research and development
     9,973        1,183  
Selling, general and administrative
     11,588        1,635  
    
 
 
    
 
 
 
Total stock-based compensation expense
   $ 32,557      $ 4,218  
    
 
 
    
 
 
 
Summary of Stock Option Activity
The following summarizes the stock option activity of the 2013 Plan for the years ended December 31, 2021 and 2020:
 
    
Options to
Purchase
Common
Stock
   
Weighted-
Average
Exercise
Price per
Share
    
Weighted-
Average
Grant
Date Fair
Value per
Share
    
Weighted-
Average
Remaining
Contract
Life
(In Years)
    
Aggregate
Intrinsic
Value
 
Outstanding — at January 1, 2020
     27,263,775     $ 0.97      $ 0.50        7.95      $ 11,941  
Granted
     90,597       1.41        0.78                    
Exercised
     (2,771,051     0.36                 3.21        2,565  
Forfeited
     (1,508,243     1.26                             
Expired
     (986,352     1.05                             
    
 
 
   
 
 
    
 
 
    
 
 
    
 
 
 
Outstanding — at December 31, 2020
     22,088,726     $ 1.03      $ 0.53        7.12      $ 85,853  
Granted
     —         —          —                 —    
Exercised
     (3,708,786     1.00        0.51        4.32        41,822  
Forfeited
     (857,579     1.21        0.60        0.01        9,131  
Expired
     (177,033     1.16        0.31               1,969  
    
 
 
   
 
 
    
 
 
    
 
 
    
 
 
 
Outstanding — at December 31, 2021
     17,345,328     $ 1.03      $ 0.54        6.03      $ 195,111  
    
 
 
   
 
 
    
 
 
    
 
 
    
 
 
 
Options vested and exercisable — at December 31, 2021
     15,112,440     $ 1.01      $ 0.52        5.90      $ 170,320  
Options vested and exercisable — at December 31, 2020
     14,739,214     $ 0.97      $ 0.49        6.83      $ 57,660  
Summary of Weighted-average Assumptions
 
The following
weighted-average
assumptions were used in the Black-Sholes option-pricing model calculation for stock options granted for the years ended December 31, 2021 and 2020:
 
    
2021
   
2020
 
Fair value per share of common stock
   $     $ 1.41  
Expected volatility
         60.0
Risk-free interest rate
         0.6
Expected life (years)
           6.25  
Dividend rate
     None       None  
Summary of Performance-based Restricted Stock Unit Activity
The following summarizes the performance-based restricted stock unit activity of the Plan for the years ended December 31,
2021
and 2020:
 
    
Number of
Units
    
Weighted-
Average
Grant
Date Fair
Value
 
Outstanding — at January 1, 2020
     6,818,453      $ 1.41  
Granted
     5,954,361        1.25  
Forfeited
     (941,759      1.40  
    
 
 
    
 
 
 
Outstanding — at December 31, 2020
     11,831,055        1.33  
Granted
     6,542,426        9.68  
Forfeited
     (1,426,559      2.10  
    
 
 
    
 
 
 
Outstanding — at December 31, 2021
     16,946,922      $ 4.49  
    
 
 
    
 
 
 
Units expected to vest — at December 31, 2021
     16,946,922      $ 4.49  
Units expected to vest — at December 31, 2020
     —        $ —