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Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2019
Accounting Policies [Abstract] |
Schedule of financial assets measured at fair value on nonrecurring basis |
|  | As of March 31, 2019 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Cash and money market accounts |  | $ | 10,584,067 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,584,067 |
Interest rate swaps |  |  | — |  |  |  | 4,117 |  |  |  | — |  |  |  | 4,117 |
Total |  | $ | 10,584,067 |  |  | $ | 4,117 |  |  | $ | — |  |  | $ | 10,588,184 |
|  | As of December 31, 2018 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Cash and money market accounts |  | $ | 2,521,050 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,521,050 |
Interest rate swaps |  |  | — |  |  |  | 40,209 |  |  |  | — |  |  |  | 40,209 |
Total |  | $ | 2,521,050 |  |  | $ | 40,209 |  |  | $ | — |  |  | $ | 2,561,259 |
Schedule of sales to significant customers |
|  | During the Three-Month Periods Ended March 31, |
|  | 2019 |  |  | 2018 |
Company A |  |  | 43 | % |  |  | 34 | %
Company B |  |  | 27 | % |  |  | 24 | %
Company C |  |  | * |  |  |  | 11 | %
| * | Amount is less than 10%
Schedule of accounts receivable due from significant customers |
|  | As of March 31, 2019 |  |  | As of December 31, 2018 |
Company A |  |  | 42 | % |  |  | 35 | %
Company B |  |  | 29 | % |  |  | 36 | %
Company C |  |  | 13 | % |  |  | 15 | %

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- Definition Tabular disclosure of accounts receivable due from significant customers that amounted to 10% or more of total trade accounts receivable as of the balance sheet date. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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