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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Stock Based Compensation Expenses Included on Operations Statement
The following table presents all stock-based compensation as included on the combined consolidated statements of operations (in thousands):
 
    
For the Year Ended December 31,
 
    
2020
    
2019
 
Stock-based compensation expense:
     
Employee stock options
     1,426        2,053  
Employee and
Non-employee
RSUs
     761        1,368  
  
 
 
    
 
 
 
   $ 2,187      $ 3,421  
  
 
 
    
 
 
 
Stock-based compensation expense in operating expenses:
     
Research and development
   $ 261      $ 1,288  
Selling, general and administrative
     1,926        2,133  
  
 
 
    
 
 
 
   $ 2,187      $ 3,421  
  
 
 
    
 
 
 
Summarizes Stock Option Activity and Related Information Under Equity Incentive Plans
The following table summarizes stock option activity and related information under all equity incentive plans for the years ended December 31, 2020 and 2019:
 
    
Number of

Shares
    
Weighted-

Average

Exercise Price
    
Aggregate

Intrinsic

Value

(in

thousands)
    
Weighted-

Average

Remaining

Contractual Life

(in years)
 
Outstanding as of December 31, 2018
     8,363,045      $ 6.54      $ 11,998        3.9  
Options exercised
     (1,993,688    $ 2.06     
Options forfeited
     (41,341    $ 7.64        
Options expired
     (247,533    $ 1.60        
  
 
 
          
Outstanding as of December 31, 2019
     6,080,483      $ 8.24      $ 14,458        5.3  
Options granted
     400,000      $ 6.21        
Options exercised
     (1,272,273    $ 1.89        
Options forfeited
     (211,926    $ 2.23        
  
 
 
          
Outstanding as of December 31, 2020
     4,996,284      $ 9.96      $ 29,746        4.7  
  
 
 
          
Vested and Exercisable as of December 31, 2020
     4,345,497      $ 10.70      $ 24,333        4.1  
  
 
 
          
Summary of Options Outstanding and Vested
The following table provides a summary of options outstanding and vested as of December 31, 2020:
 
Exercise Prices
  
Number

Outstanding
    
Weighted-

Average Remaining

Contractual Life

(in years)
    
Number

Exercisable
   
Weighted-

Average Remaining

Contractual Life

(in years)
 
$0.4213
     512,036        3.9        512,036       3.9  
$0.78
     49,549        2.6        49,549       2.6  
$1.7554
     288,404        4.0        288,404       4.0  
$1.9984
     262,120        4.1        262,120       4.1  
$2.18
     1,842        5.5        1,842       5.5  
$2.87
     982        5.7        880       6.4  
$3.07
     600,000        7.7        349,998       7.7  
$3.4-$3.98
     1,163,543        3.0        1,163,543       3.0  
$4.54
     255,806        0.3        255,806       0.3  
$6.21
     400,000        9.4        —         —    
$8.19
     6,552        5.7        5,869       5.7  
$25.00
     1,455,450        4.6        1,455,450       4.6  
  
 
 
       
 
 
   
     4,996,284        4.7        4,345,497       4.1  
  
 
 
       
 
 
   
Weighted Average of Fair Value of Options Under Black-Scholes Option-Pricing Model
We may grant stock options to both employees and directors of the company and to employees of related parties that provide shared services to the company under our shared services agreement with NantWorks, as discussed in Note 9,
Related Party Agreements
. The fair value of each stock option issued was estimated at the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:
 
    
For the Year Ended December 31,
 
    
2020
   
2019
 
Expected term (in years)
     5.5       N/A  
Risk-free interest rate
     0.4     N/A  
Expected volatility
     96.8     N/A  
Dividend yield
     0.0     N/A  
Weighted-average grant date fair value
   $ 4.64       N/A  
Restricted Stock Units (RSUs) Activity
The following table summarizes the restricted stock units, or RSUs, activity under the 2015 Plan:
 
    
Number of

RSUs

Outstanding
    
Weighted-

Average

Grant Date

Fair Value
 
Unvested balance as of December 31, 2018
     875,589      $ 6.70  
Granted
     749,793      $ 1.12  
Vested
     (401,193    $ 8.82  
Forfeited/canceled
     (83,225    $ 7.29  
  
 
 
    
Unvested balance as of December 31, 2019
     1,140,964      $ 2.24  
Granted
     33,500      $ 6.43  
Vested
     (649,872    $ 2.05  
Forfeited/canceled
     (57,750    $ 4.47  
  
 
 
    
Unvested balance as of December 31, 2020
     466,842      $ 2.52  
  
 
 
    
Summary of Warrant Activity
The following table summarizes our warrant activity:
 
Outstanding as of December 31, 2018
     21,302,049  
Warrants exercised
     (19,664,049
  
 
 
 
Outstanding as of December 31, 2019
     1,638,000  
Warrants exercised
     —    
  
 
 
 
Outstanding as of December 31, 2020
     1,638,000