| Short-Term Investments (Details Narrative) - USD ($) | 3 Months Ended | |
|---|---|---|
| Mar. 31, 2020 | Mar. 31, 2019 | |
| Investments, Debt and Equity Securities [Abstract] | ||
| Amortized cost of available-for-sale debt securities | $ 75,501,000 | |
| Realized gains or losses recognized on sale or maturity of available-for-sale debt securities | ||
| X | ||||||||||
| 
- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
 | 
| X | ||||||||||
| 
- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. No definition available. 
 | 
| X | ||||||||||
| 
- References No definition available. 
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