Short-term Investments	6 Months Ended
Jun. 30, 2019
Investments Schedule [Abstract]
Short-term Investments	SHORT-TERM INVESTMENTS Short-term investments at June 30, 2019 were composed of U.S. Treasury Bills totaling $24.8 million, consisting of $8.9 million maturing on September 12, 2019 and $15.9 million maturing on December 12, 2019. The interest rates on the U.S. Treasury Bills held on June 30, 2019 that are maturing on September 12, 2019 and December 12, 2019 were 2.3% and 1.9%, respectively. Short-term investments at December 31, 2018 were composed of U.S. Treasury Bills totaling $24.8 million, consisting of $9.0 million, $10.9 million, and $4.9 million that matured on March 14, 2019, June 6, 2019, and June 20, 2019, respectively. The interest rates on the U.S. Treasury Bills held on December 31, 2018 that matured on March 14, 2019, June 6, 2019, and June 20, 2019 were 2.2%, 2.4%, and 2.3%, respectively. The investments are classified as held-to-maturity and recorded at cost plus accrued interest, which approximates fair value. We do not intend to sell these investments, and it is not more likely than not that we will be required to sell the investments before we recover their amortized cost bases.

Short-term investments at June 30, 2019 were composed of U.S. Treasury Bills totaling $24.8 million, consisting of $8.9 million maturing on September 12, 2019 and $15.9 million maturing on December 12, 2019. The interest rates on the U.S. Treasury Bills held on June 30, 2019 that are maturing on September 12, 2019 and December 12, 2019 were 2.3% and 1.9%, respectively. Short-term investments at December 31, 2018 were composed of U.S. Treasury Bills totaling $24.8 million, consisting of $9.0 million, $10.9 million, and $4.9 million that matured on March 14, 2019, June 6, 2019, and June 20, 2019, respectively. The interest rates on the U.S. Treasury Bills held on December 31, 2018 that matured on March 14, 2019, June 6, 2019, and June 20, 2019 were 2.2%, 2.4%, and 2.3%, respectively. The investments are classified as held-to-maturity and recorded at cost plus accrued interest, which approximates fair value. We do not intend to sell these investments, and it is not more likely than not that we will be required to sell the investments before we recover their amortized cost bases.