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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Fair Value of Stock Options Granted to Employees and Directors
The assumptions that the Company used to determine the grant-date fair value of stock options granted during these periods were as follows, presented on a weighted-average basis:
 
   
September 30,
2019
  
September 30,
2018
 
Risk-free interest rate
   2.24  2.74
Expected term (in years)
   6.50   5.82 
Expected volatility
   42.7  42.9
Expected dividend yield
   0.0  0.0
Exercise price
  $7.08  $5.40 
Underlying stock price
  $7.08  $5.40 
Summary of Stock Option Activity
The following table summarizes the Company’s stock option activity since December 31, 2018 (in thousands, except share and per share amounts):
 
   
Number of
Shares
   
Weighted
Average
Exercise
Price
   
Weighted
Average
Remaining
Contractual
Term
(in years)
   
Aggregate
Intrinsic
Value
 
Outstanding as of December 31, 2018
   7,266,185   $1.92    5.89   $33,909 
Granted
   100,000    7.08           
Canceled / forfeited
   (11,150   2.87           
   
 
 
                
Exercised
   (91,045   1.77         382 
   
 
 
                
Outstanding as of September 30, 2019
   7,263,990    1.99    5.31    33,359 
   
 
 
                
Options exercisable as of September 30, 2019
   5,736,926    1.59    4.69    28,546 
   
 
 
                
Options vested or expected to vest as of September 30, 2019
   7,025,841   $1.91    5.20   $32,797