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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2020
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of the company's stock option activity and related information
A summary of stock option activity and related information is as follows:
OptionsWeighted Average
Exercise Price		Weighted average
remaining
contractual term
(years)		Aggregate intrinsic
value (in thousands)
Outstanding at December 31, 20192,844,164  $30.41  7.9$124,585  
Granted66,974  $71.13  
Exercised(254,142) $3.10  $13,782  
Forfeited(31,207) $29.47  
Outstanding at March 31, 20202,625,789  $34.10  7.9$76,037  
Exercisable at March 31, 20201,068,835  $11.63  6.4$52,002  
Schedule of stock compensation recognized, before taxes
Total stock-based compensation recognized, before taxes, during the three months ended March 31, 2020 and 2019, is as follows:
Three Months Ended
March 31,
20202019
Cost of goods sold$53  $26  
Research and development345  163  
Selling, general and administrative2,351  1,202  
Total stock-based compensation$2,749  $1,391  
Summary of weighted average assumptions for fair value of options granted The fair value of options granted to employees and non-employee directors during the three months ended March 31, 2020 and 2019 was estimated as of the grant date using the Black-Scholes option pricing model using the following assumptions:
Three Months Ended
March 31,
20202019
Expected life (years)
6.25
6.25
Expected volatility
42.3 - 48.2%
49.6 - 50.6%
Risk-free interest rate
0.55 - 1.42%
2.31 - 2.63%
Dividend yield0.0%0.0%
Weighted average fair value$31.48$27.57