Short-term Investments	12 Months Ended
Short-term Investments	Dec. 31, 2015
Short-term Investments [Abstract]
Short-term Investments	6. Short-term Investments The Company held $35.0 million of short-term investments at December 31, 2015. The Company has classified these investments as available for sale. These investments are comprised of federally insured certificates of deposit as follows: $15.0 million with a maturity date of February 26, 2016, and $20.0 million with a maturity date of March 31, 2016. At December 31, 2014, the Company held $45.6 million of short-term investments, which have since matured.

The entire disclosure for investments in certain debt and equity securities.