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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Stock-Based Compensation Expense

Stock-based compensation expense is included in the following line items in the condensed consolidated statements of operations (in thousands):
    
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2019
 
2018
 
2019
 
2018
Sales and marketing
$
534

 
$
301

 
$
1,385

 
$
855

General and administrative
1,714

 
1,191

 
4,762

 
3,700

Research and development
2,787

 
1,965

 
8,574

 
5,115

Total stock-based compensation expense
$
5,035

 
$
3,457

 
$
14,721

 
$
9,670


The following table summarizes the components of non-cash stock-based compensation expense (in thousands):
    
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2019
 
2018
 
2019
 
2018
Stock options and assumed options
$
941

 
$
850

 
$
2,836

 
$
2,666

Restricted stock units
4,046

 
2,585

 
11,746

 
6,900

Restricted stock awards
—

 
—

 
—

 
1

Employee stock purchase plan
48

 
22

 
139

 
103

Total stock-based compensation expense
$
5,035

 
$
3,457

 
$
14,721

 
$
9,670

Tax benefit from stock-based awards
$
565

 
$
2,958

 
$
4,050

 
$
6,899