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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2022
Stock-Based Compensation (Tables) [Line Items]  
Schedule of stock option and restricted stock unit
 
          
Stock Options
     
Restricted Stock Units
  
    
Number of
Shares
Available
for Issuance
Under the
Plan
    
Number
of
Shares
    
Weighted-
Average
Exercise
Price
     
Number
of
Shares
    
Weighted-
Average
Grant
Date Fair
Value
  
                                 
    
(in thousands, except per share data)
  
Balance
as of 
December 31, 2021
      1,821       4,747     $ 7.61        850     $ 11.41  
Granted
      (1,370 )      821       3.18        549       3.15  
Options exercised and RSUs vested
      49       —         —          (130 )      11.17  
Forfeited or expired
      600       (378 )      7.61        (222 )      11.51  
    
 
 
    
 
 
    
 
 
     
 
 
    
 
 
  
Balance
as of 
September 30, 2022
      1,100       5,190     $ 6.91        1,047     $ 6.96  
    
 
 
    
 
 
    
 
 
     
 
 
    
 
 
  
Schedule of assumptions used to value the company's stock options grants
 
    
Three months ended September 30,
    
Nine months ended September 30,
  
    
2022
     
2021
    
2022
    
2021
  
                           
Dividend yield
      N/A        0 %      0 %      0 % 
Expected volatility
      N/A        60 %     
60% - 70
 %      60 % 
Expected term (years)
      N/A        6.25      
6.00 - 6.50
      
2.50 - 6.25
  
Risk-free interest rate
      N/A        1.01 %     
1.40% - 2.95
 %     
0.14% - 1.11
 % 
Weighted average grant date fair value
     
N/A
      $ 6.51     $ 1.91     $ 6.58  
     
    
(in thousands)
    
(in thousands)
  
Stock-based compensation - Options
    $ 999      $ 882     $ 2,913     $ 3,611  
Stock-based compensation - RSUs
    $ 674      $ 704     $ 2,142     $ 1,835