Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) |
12 Months Ended | ||
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Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
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| Allowance for doubtful accounts | |||
| Valuation and Qualifying Accounts Disclosure [Line Items] | |||
| Balance | $ 271,855 | $ 192,262 | $ 94,095 |
| Charges to Costs and Expenses | 223,323 | 103,355 | 125,371 |
| Deductions (Chargeoffs) | (33,839) | (23,762) | (27,204) |
| Balance | 461,339 | 271,855 | 192,262 |
| Allowance for expiring inventory | |||
| Valuation and Qualifying Accounts Disclosure [Line Items] | |||
| Balance | 960,065 | 711,365 | 404,211 |
| Charges to Costs and Expenses | 1,290,076 | 1,036,969 | 1,002,919 |
| Deductions (Chargeoffs) | (1,438,000) | (788,269) | (695,765) |
| Balance | $ 812,141 | $ 960,065 | $ 711,365 |
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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