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Other Current Liabilities - Summary of Other Current Liabilities (Detail) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Other Liabilities Disclosure [Abstract] |  |
Accrued payroll expenses | $ 7,120,055 | $ 7,032,508
Deferred revenue | 1,868,223 | 1,893,508
Dividends payable | 1,367,761 | 1,286,381
Trade sales payable | 1,250,454 | 1,276,170
Deferred rent | 1,561,486 | 1,349,515
Other accrued expenses | 6,013,129 | 5,961,113
Other current liabilities | $ 19,181,108 | $ 18,799,195

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- Definition Carrying value as of the balance sheet date of the obligations incurred through that date and payable for employees' services provided. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6911-107765 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 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765 + Details
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