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Short-Term Investments	6 Months Ended
Short-Term Investments	Jun. 30, 2018
Short-Term Investments
Short-Term Investments	3.Short-Term Investments The Company’s $2.9 million of short-term investments at June 30, 2018 is comprised of twelve fully insured certificates of deposit with original maturities ranging from five to six months and interest rates ranging from 1.55% to 2.00%.