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Real Estate and Lease Intangibles - Summary of Future Lease Expirations by Year for Properties (Detail) | 12 Months Ended
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Dec. 31, 2016 USD ($) a lease | Dec. 31, 2015 USD ($) a | Dec. 31, 2014 USD ($)
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Number of Expiring Leases | lease | 47 |  |
Expiring Leased Acreage | a | 50,592 | 16,810 |
Total Acreage (as percent) | 100.00% |  |
Rental revenue | $ | $ 17,305,469 | $ 11,888,091 | $ 7,170,318
Total Rental Revenue (as percent) | 100.00% |  |
2017 |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Number of Expiring Leases | lease | 11 |  |
Expiring Leased Acreage | a | 866 |  |
Total Acreage (as percent) | 1.70% |  |
Rental revenue | $ | $ 2,296,025 |  |
Total Rental Revenue (as percent) | 13.30% |  |
2018 |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Number of Expiring Leases | lease | 4 |  |
Expiring Leased Acreage | a | 2,710 |  |
Total Acreage (as percent) | 5.40% |  |
Rental revenue | $ | $ 825,485 |  |
Total Rental Revenue (as percent) | 4.80% |  |
2019 |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Number of Expiring Leases | lease | 3 |  |
Expiring Leased Acreage | a | 2,524 |  |
Total Acreage (as percent) | 5.00% |  |
Rental revenue | $ | $ 419,740 |  |
Total Rental Revenue (as percent) | 2.40% |  |
2020 |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Number of Expiring Leases | lease | 9 |  |
Expiring Leased Acreage | a | 28,200 |  |
Total Acreage (as percent) | 55.70% |  |
Rental revenue | $ | $ 5,247,810 |  |
Total Rental Revenue (as percent) | 30.30% |  |
2021 |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Number of Expiring Leases | lease | 4 |  |
Expiring Leased Acreage | a | 6,954 |  |
Total Acreage (as percent) | 13.70% |  |
Rental revenue | $ | $ 1,606,592 |  |
Total Rental Revenue (as percent) | 9.30% |  |
2022 |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Number of Expiring Leases | lease | 1 |  |
Expiring Leased Acreage | a | 145 |  |
Total Acreage (as percent) | 0.30% |  |
Rental revenue | $ | $ 315,896 |  |
Total Rental Revenue (as percent) | 1.80% |  |
Thereafter |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Number of Expiring Leases | lease | 15 |  |
Expiring Leased Acreage | a | 9,193 |  |
Total Acreage (as percent) | 18.20% |  |
Rental revenue | $ | $ 6,593,921 |  |
Total Rental Revenue (as percent) | 38.10% |  |

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