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Schedule I - Valuation and Qualifying Accounts (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Allowance for Doubtful Accounts (Deducted from Accounts Receivable) [Member] |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Balance at Beginning of Period | $ 1,623,408 | $ 1,537,353
Charged to Costs and Expenses | 2,842,941 | 1,471,875
Deductions | 2,455,628 | 1,385,820
Balance at End of Period | 2,010,721 | 1,623,408
Valuation Allowance for Deferred Tax Assets [Member] |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Balance at Beginning of Period | 328,170 | 528,179
Charged to Costs and Expenses | 3,446,579 | 36,794
Deductions | 14,295 | 236,803
Balance at End of Period | $ 3,760,454 | $ 328,170

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of decrease in valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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