Fair Value Measurements (Fair Value, Options Measured on Recurring Basis) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Fair Value Measurements [Abstract]
Unrealized gain on fair value adjustment for options - short position	$ (34)	$ 0	$ (34)

Unrealized gain (loss) on fair valuation of options.

No definition available.

Name:	cik0001640982_UnrealizedGainLossOnFairValuationOfOptions
Namespace Prefix:	cik0001640982_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration