Annual report pursuant to Section 13 and 15(d)

Property and Equipment - Narrative (Details)

v3.20.4
Property and Equipment - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Gain (loss) on write down of property plant equipment $ (0.3)  
Depreciation expense 0.3 $ 0.2
Lab equipment    
Property, Plant and Equipment [Line Items]    
Lab equipment held for testing $ 0.3 $ 0.7