Syndication Costs (Schedule of Syndication Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Syndication Costs [Abstract]
Syndication costs	$ 0	$ 51
Percentage of offering proceeds, limit on reimbursements to Managing Members and/or affiliates	15.00%

Organization and offering expenses during the period. Such costs include selling commissions, document preparation, regulatory filing fees, and accounting and legal costs.

No definition available.

Name:	cik0001640982_OrganizationAndOfferingExpenses
Namespace Prefix:	cik0001640982_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration