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Cash, Cash Equivalent, and Investments (Tables) | 12 Months Ended
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Dec. 31, 2018
Cash and Cash Equivalents [Abstract] |
Schedule of Cash, Available-for-sale Securities, Short-term and Long-term Investment Securities | The following table shows the Company’s cash, available-for-sale securities, and short-term and long-term investment securities by major security type as of December 31, 2018 and 2017:
| December 31, 2018
|  |  |  |  | Gross |  | Gross |  |
| Level |  |  |  | Unrealized |  | Unrealized |  |
| (1) |  | Fair Value |  | Holding Gains |  | Holding Losses |  | Adjusted Cost
Cash and Cash Equivalents |  |  |  |  |  |  |  |  |
Cash |  |  | $ | 1,048,272 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,048,272 |
Money Market Funds | 1 |  | 1,338,042 |  |  |  |  |  |  | 1,338,042 |
Subtotal |  |  | 2,386,314 |  |  | — |  |  | — |  |  | 2,386,314 |
Short-Term Investment Securities (2) |  |  |  |  |  |  |  |  |
Corporate Bonds (4) | 2 |  | 38,731,120 |  |  | — |  |  | (85,321 | ) |  | 38,816,441 |
Long-Term Investment Securities (3) |  |  |  |  |  |  |  |  |
Corporate Bonds | 2 |  | — |  |  | — |  |  | — |  |  | — |
Total |  |  | $ | 41,117,434 |  |  | $ | — |  |  | $ | (85,321 | ) |  | $ | 41,202,755 |
| December 31, 2017
|  |  |  |  | Gross |  | Gross |  |
| Level |  |  |  | Unrealized |  | Unrealized |  |
| (1) |  | Fair Value |  | Holding Gains |  | Holding Losses |  | Adjusted Cost
Cash and Cash Equivalents |  |  |  |  |  |  |  |  |
Cash |  |  | $ | 838,110 |  |  | $ | — |  |  | $ | — |  |  | $ | 838,110 |
Money Market Funds | 1 |  | 4,948,238 |  |  | — |  |  | — |  |  | 4,948,238 |
Subtotal |  |  | 5,786,348 |  |  | — |  |  | — |  |  | 5,786,348 |
Short-Term Investment Securities (2) |  |  |  |  |  |  |  |  |
Corporate Bonds (4) | 2 |  | 41,811,273 |  |  | — |  |  | (87,481 | ) |  | 41,898,754 |
Long-Term Investment Securities (3) |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate Bonds (4) | 2 |  | 911,698 |  |  | — |  |  | (10,950 | ) |  | 922,648 |
Total |  |  | $ | 48,509,319 |  |  | $ | — |  |  | $ | (98,431 | ) |  | $ | 48,607,750 |
_________________ Notes: (1) Definition of the three-level fair value hierarchy:
• | Level 1 - Quoted prices (unadjusted) in active markets for identical assets or liabilities
• | Level 2 - Other inputs that are directly or indirectly observable in the markets
• | Level 3 - Inputs that are generally unobservable
(2) Short-term investment securities will mature within 12 months or less, from the applicable reporting date. (3) Long-term investment securities will mature between 12 and 18 months, from the applicable reporting date. (4) The premium paid to purchase held-to-maturity investment securities was $378,681 and $915,084 for the years ended December 31, 2018 and 2017, respectively.

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