Manager and Other Related Parties - Formation Loan, Future Minimum Payments (Details)	Mar. 31, 2018 USD ($)
Formation Loan Future Minimum Payments [Abstract]
2018	$ 377,709
2019	377,709
2020	377,709
2021	377,709
2022	377,709
Thereafter	2,245,286
Total	$ 4,133,831

Remaining formation loan balance to be repaid after the repayments made in the prior years shown.

No definition available.

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Namespace Prefix:	ck0001448038_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Formation loan future minimum payments.

No definition available.

Name:	ck0001448038_FormationLoanFutureMinimumPaymentsAbstract
Namespace Prefix:	ck0001448038_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Formation loan balance excluding the unamortized discount.

No definition available.