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Marketable Securities	12 Months Ended
Marketable Securities	Dec. 31, 2019
Marketable Securities [Abstract]
Marketable Securities	Note 5 – Marketable Securities The Company’s current investment policy is to invest in cash, certificates of deposit, U.S. treasury securities, U.S. government agency obligations and money market funds invested in U.S. government securities. Marketable securities of $18,019 as of December 31, 2018 consisted of U.S. treasury securities held to maturity and certificates of deposit with original maturities of greater than 90 days and up to one year. The Company had no marketable securities as of December 31, 2019. Due to the short-term nature of these securities and their low interest rates, there is no material difference between their fair market values and amortized costs.