XML 53 R42.htm IDEA: XBRL DOCUMENT v3.21.2
Fair value - Activity for the Level 3 asset (Details)
9 Months Ended
Sep. 30, 2021
USD ($)
Net asset arising from put/call options  
Balance as of December 31, 2020 $ 690,000
Unrealized gain (108,000)
Balance as of September 30, 2021 $ 582,000