Short-Term Investments	12 Months Ended
Dec. 31, 2017
Investments Schedule [Abstract]
Short-Term Investments	SHORT-TERM INVESTMENTS Short-term investments at December 31, 2017 consisted of U.S Treasury Bills totaling $11.0 million that matured through January 11, 2018. Short-term investments at December 31, 2016 consisted of U.S. Treasury Bills totaling $42.9 million that matured through June 15, 2017. The interest rate on the U.S. Treasury Bills is less than one percent. 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 our short-term investments and it is not more likely than not that we will be required to sell such investments before recovery of their amortized cost bases, which may be maturity. The fair value of the U.S. Treasury Bills at December 31, 2017 and December 31, 2016 were classed as Level 1 as they are traded with sufficient frequency and volume to enable us to obtain pricing information on an ongoing basis. For further discussion of fair value, refer to Note 9, “Fair Value Measurements.”

SHORT-TERM INVESTMENTS

Short-term investments at December 31, 2017 consisted of U.S Treasury Bills totaling $11.0 million that matured through January 11, 2018. Short-term investments at December 31, 2016 consisted of U.S. Treasury Bills totaling $42.9 million that matured through June 15, 2017. The interest rate on the U.S. Treasury Bills is less than one percent. 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 our short-term investments and it is not more likely than not that we will be required to sell such investments before recovery of their amortized cost bases, which may be maturity. The fair value of the U.S. Treasury Bills at December 31, 2017 and December 31, 2016 were classed as Level 1 as they are traded with sufficient frequency and volume to enable us to obtain pricing information on an ongoing basis. For further discussion of fair value, refer to Note 9, “Fair Value Measurements.”