Annual report pursuant to Section 13 and 15(d)

Short-Term Investments - Schedule of Available-for-sale Investments Held (Details)

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Short-Term Investments - Schedule of Available-for-sale Investments Held (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]    
U.S. government and agency securities and treasuries $ 66,218,000