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Stockholders' Equity (Deficit) (Tables)
12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Schedule of Key Assumptions Used to Determine Fair Value of Options Granted
The weighted-averages for key assumptions used in determining the fair value of stock options granted were as follows:
 
Year Ended December 31,
 
2019
 
2018
Volatility
59.32%
 
57.76%
Risk-free interest rate
2.42%
 
2.65%
Expected life (years)
6.17
 
6.24
Dividend yield rate
—%
 
—%
Schedule of Stock Options Activity
A summary of stock option activity under the Plan for the year ended December 31, 2019, is presented below:
 
 
 
 
 
Weighted
 
 
 
 
 
Weighted
 
Average
 
 
 
 
 
Average
 
Remaining
 
Aggregate
 
Stock
 
Exercise
 
Contractual
 
Intrinsic
 
Options
 
Per Share
 
Terms (Years)
 
Value
Outstanding, December 31, 2018
3,257,801

 
$
11.99

 
9.26
 
$
7,119

Granted
1,321,451

 
$
18.63

 
 
 
 
Exercised
(273,734
)
 
$
9.98

 
 
 
 
Cancelled/forfeited
(328,117
)
 
$
15.15

 
 
 
 
Outstanding, December 31, 2019
3,977,401

 
$
14.07

 
8.51
 
$
7,198

Exercisable, December 31, 2019
800,595

 
$
12.50

 
8.28
 
$
1,880

Vested and expected to vest, December 31, 2019
3,977,401

 
$
14.07

 
8.51
 
$
7,198

Schedule of RSUs Activity
A summary of RSUs activity under the Plan for the year ended December 31, 2019, is presented below:
 
 
 
Weighted
 
Restricted
 
Average
 
Stock
 
Grant Date
 
Units
 
Fair Value
Outstanding, December 31, 2018
271,404

 
$
16.53

Granted
3,000

 
$
18.33

Vested
(25,125
)
 
$
24.81

Forfeited
(19,409
)
 
$
13.71

Outstanding, December 31, 2019
229,870

 
$
15.89

Schedule of Stock-based Compensation Expense
The following table summarizes stock-based compensation expense arising from the above Plan:
 
Year Ended December 31,
 
2019
 
2018
Selling, general and administrative
$
8,862

 
$
5,570

Research and development
656

 
1,401

Total stock-based compensation expense
$
9,518

 
$
6,971