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Short-term Investment	6 Months Ended
Short-term Investment	Jun. 30, 2016
Short-term Investment [Abstract]
Short-term Investment	4. Short-term Investment The Company held no short-term investments at June 30, 2016, as compared to $35.0 million at December 31, 2015. The Company classified these investments as available for sale at December 31, 2015.

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