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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of restricted stock unit activities
   Restricted Stock Units   Weighted Average Grant Date Fair Value 
Non-vested 1/1/2021   274,616   $29.95 
Granted   -    - 
Forfeited   -    - 
Vested   (92,186)   30.00 
Non-vested 3/31/2021   182,430   $29.93 
Schedule of the fair value of stock options granted
   For the three months ended
March 31,
 
   2021   2020 
Stock price  $ 17.83 - $ 19.82   $ 30.00 - $ 37.30 
Exercise price  $17.83 - $ 19.82   $30.00 - $ 37.30 
Dividend yield   0.00%   0.00%
Expected volatility   98.00%   101.00%
Risk-free interest rate   0.45% - 0.62%   1.45% - 1.69%
Expected life (in years)   5.27 - 6.08    6.08 
Schedule of stock option activities
   Options   Weighted Average Exercise Price   Weighted Average Remaining Contractual Term (years)   Aggregate Intrinsic Value 
Outstanding 1/1/2021   674,039   $25.23    9.06   $2,311 
Granted   504,800    19.56    -    - 
Exercised   -    -    -    - 
Forfeited   (27,512)   23.22    -    - 
Outstanding 3/31/2021   1,151,327   $22.79    9.19   $900 
                     
Exercisable as of 3/31/2021   199,097   $22.15    8.06   $575 
Schedule of total stock-based compensation costs
   For the three months ended March 31, 
   2021   2020 
RSUs  $1,303   $2,430 
Stock options   1,437    368 
Total  $2,740   $2,798 
Schedule of stock based compensation expense
   For the three months ended March 31, 
   2021   2020 
Research and development  $270   $209 
General and administrative   2,470    2,589 
Total  $2,740   $2,798