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Prepaid Expenses (Tables)
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Other Income and Expenses [Abstract]    
Schedule of prepaid expenses
 

March 31,
2021

  

December 31,
2020

Prepaid clinical expenses

  

$

5,088

  

$

5,151

Prepaid insurance expense

  

 

177

  

 

206

Other

  

 

1,736

  

 

1,219
   

$

7,001

  

$

6,576
 

December 31, 2020

  

December 31, 2019

Prepaid clinical expenses

  

$

5,151

  

$

705

Prepaid insurance expense

  

 

206

  

 

—

Other

  

 

1,219

  

 

1,183
   

$

6,576

  

$

1,888