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Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Schedule of Restrictions on Cash and Cash Equivalents
   December 31, 
   2020   2019 
         
Cash and cash equivalents, as reported on the balance sheets  $4,319   $3,924 
Restricted cash, as reported on the balance sheets   390    375 
Restricted cash in other long-term assets, as reported on the balance sheets   199    199 
           
Cash, cash equivalents, and restricted cash, as reported in the statements of cash flows  $4,908   $4,498 
Schedule of Property and equipment useful life
   % 
     
Computers, software and laboratory equipment   15 - 33 
Furniture and office equipment   15 
Leasehold improvements   Over the shorter of the term of the lease or its useful life