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Summary of Business and Significant Accounting Policies - Costs (Detail) - USD ($) | 6 Months Ended |
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Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018
Summary of Business and Significant Accounting Policies |  |  |
Deferred financing costs | $ 981,000 |  | $ 981,000
Accumulated amortization of deferred financing costs | 898,000 |  | $ 740,000
Amortization of deferred financing costs | $ 158,000 | $ 108,000 |

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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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