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Cash, Cash Equivalent, and Investments (Tables) | 6 Months Ended
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Jun. 30, 2019
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 June 30, 2019 and December 31, 2018:
| June 30, 2019 (Unaudited)
|  |  |  |  | Gross |  | Gross |  |
| Level |  |  |  | Unrealized |  | Unrealized |  |
| (1) |  | Fair Value |  | Holding Gains |  | Holding Losses |  | Adjusted Cost
Cash and Cash Equivalents |  |  |  |  |  |  |  |  |
Cash |  |  | $ | 767,894 |  |  | $ | — |  |  | $ | — |  |  | $ | 767,894 |
Money Market Funds | 1 |  | 4,013,626 |  |  |  |  |  |  | 4,013,626 |
Subtotal |  |  | 4,781,520 |  |  | — |  |  | — |  |  | 4,781,520 |
Short-Term Investment Securities (2) |  |  |  |  |  |  |  |  |
Corporate Bonds (4) | 2 |  | 32,119,864 |  |  | 20,490 |  |  | (4,775 | ) |  | 32,104,149 |
Long-Term Investment Securities (3) |  |  |  |  |  |  |  |  |
Corporate Bonds (4) | 2 |  | 1,522,290 |  |  | 5,621 |  |  | — |  |  | 1,516,669 |
Total |  |  | $ | 38,423,674 |  |  | $ | 26,111 |  |  | $ | (4,775 | ) |  | $ | 38,402,338 |
| December 31, 2018 (Audited)
|  |  |  |  | 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 |
Total |  |  | $ | 41,117,434 |  |  | $ | — |  |  | $ | (85,321 | ) |  | $ | 41,202,755 |
_________________ 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 $23,308 and $26,014 for the three months ended June 30, 2019 and 2018, respectively. The premium paid to purchase held-to-maturity investment securities was $104,163 and $313,705 for the six months ended June 30, 2019 and 2018, respectively. The premium paid to purchase held-to-maturity investment securities was $378,681 for the year ended December 31, 2018.

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- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
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