Short Term Investments	12 Months Ended
	Dec. 31, 2018
Investments Schedule [Abstract]
Short Term Investments	SHORT-TERM INVESTMENTSShort-term investments at December 31, 2018 consisted of U.S. Treasury Bills totaling $24.8 million, consisting of $9.0 million maturing on March 14, 2019, $10.9 million maturing on June 6, 2019, and $4.9 million maturing on June 20, 2019. Short-term investments at December 31, 2017 consisted of U.S. Treasury Bills totaling $11.0 million that matured on January 11, 2018. The interest rates on the U.S. Treasury Bills held on December 31, 2018 and maturing on March 14, 2019, June 6, 2019, and June 20, 2019 were 2.2%, 2.4%, and 2.3%, respectively, and were less than one percent for the U.S. Treasury Bills held as of December 31, 2017. The investments are classified as held-to-maturity and recorded at cost plus accrued interest, which approximates fair value.