Annual report pursuant to Section 13 and 15(d)

Revenue Related Disclosures - Additional Information (Details)

v3.21.1
Revenue Related Disclosures - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
United States      
Disaggregation Of Revenue [Line Items]      
Revenues $ 45.0 $ 39.7 $ 33.9
South Africa      
Disaggregation Of Revenue [Line Items]      
Revenues 0.7 $ 1.0 $ 0.9
Bahamas      
Disaggregation Of Revenue [Line Items]      
Revenues $ 0.7