Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details)

v3.21.1
Commitments and Contingencies (Details) - USD ($)
$ in Millions
2 Months Ended 12 Months Ended
Jun. 15, 2012
Feb. 26, 2021
Dec. 31, 2020
Dec. 31, 2019
Oak Ridge National Laboratory [Member]        
Commitments and Contingencies (Details) [Line Items]        
Purchase of materials     $ 0.2 $ 0.2
Oak Ridge National Laboratory [Member] | Subsequent Event [Member]        
Commitments and Contingencies (Details) [Line Items]        
Purchase of materials   $ 0.3    
License and Sponsored Research Agreement [Member] | Fred Hutchinson Cancer Research Center [Member]        
Commitments and Contingencies (Details) [Line Items]        
Milestone payment $ 1.0      
Description of royalty payment royalty payments of 2% of net sales will be due to FHCRC.