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Short-Term Investments	3 Months Ended
Short-Term Investments	Mar. 31, 2018
Short-Term Investments
Short-Term Investments	3.Short-Term Investments The Company’s $2.7 million of short-term investments at March 31, 2018 is comprised of 11 fully insured certificates of deposit with original maturities ranging from four to six months and interest rates ranging from 1.25% to 1.70%