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v3.19.1

ALLOWANCE FOR DOUBTFUL ACCOUNTS AND BAD DEBT EXPENSE (Details) | 1 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | ---
Jul. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) property | Dec. 31, 2017 USD ($) property | Dec. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) tenant
ALLOWANCE FOR DOUBTFUL ACCOUNTS AND BAD DEBT EXPENSE |  |  |  |  |
Aggregate bad debt expense relating to rental income, tenant reimbursements and unbilled rent receivable |  |  |  | $ 105,000 |
Balance in allowance for doubtful accounts |  | $ 0 | $ 0 |  | $ 0
Bad debt expense |  | 684,000 | $ 291,000 | $ 98,000 |
Number of tenants in bankruptcy | tenant |  |  |  |  | 5
Write-off of unbilled rent receivable | $ 74,000 |  |  |  |
Number of properties sold related to bad debt expense | property |  |  | 3 |  |
Impairment loss |  | $ 0 | $ 153,000 |  |
Number of remaining properties have no impairment | property |  | 2 |  |  |
Net book value of properties |  | $ 18,143,000 |  |  | $ 18,143,000

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- Definition Net book value of properties with bad debt and no impairment charge. + References No definition available. + Details
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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 + Details
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