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Stock-based Compensation (Tables)
 6 Months Ended
Jun. 30, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of fair value of options granted
Expected volatility   96.5%
Expected dividend yield   
—
 
Expected term (in years)   2.99 
Risk-free interest rate   0.44%

 
Schedule of stock option activity
   Number of
Options		   Weighted
Average
Exercise
Price Per
Share		   Weighted
Average
Remaining
Contractual
Term
(years)		   Aggregate
Intrinsic
Value (1)		 
Outstanding at December 31, 2020   496,471   $8.63    3.9   $
—
 
Granted   575,565   $1.65    4.8   $
—
 
Exercised   
—
   $
—
    
—
   $
—
 
Forfeited   (2,375)  $
—
    
—
   $
—
 
Expired   
—
   $
—
    
—
   $
—
 
Outstanding at June 30, 2021   1,069,661   $4.73    2.3   $
—
 
Exercisable at June 30, 2021   386,489   $9.05    2.1   $
—
 

 
Schedule of summarizes restricted stock unit activity
   Number  of
Units		   Weighted Average
Grant-Date Fair
Value Per Unit		 
Outstanding as of December 31, 2020   32,072   $2.01 
Granted   
—
   $
—
 
Vested   (31,405)  $1.97 
Forfeited   
—
   $
—
 
Outstanding as of June 30, 2021   667   $1.80 

 
Schedule of stock-based compensation expense
   Three Months Ended
June 30,		   Six Months Ended
June 30,		 
   2021   2020   2021   2020 
                 
Research and development  $-   $2   $2   $5 
Selling, general and administrative   182    138    335    286 
Total stock-based compensation expense  $182   $140   $337   $291