Quarterly report pursuant to Section 13 or 15(d)

Schedule of Accrued Expenses (Details) (Parenthetical)

v3.21.1
Schedule of Accrued Expenses (Details) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
CFF Agreement [Member]    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]    
Deferred liability $ 153 $ 577
Genentech Feasibility Study Agreement [Member]    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]    
Deferred revenue $ 33 $ 67