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Long-term debt	6 Months Ended
Long-term debt	Jun. 30, 2018
Debt Disclosure [Abstract]
Long-term debt	4. Long-term debt As of June 30, 2018, the Company has no borrowings under the five year $125 million secured revolving credit facility it entered into in August 2015 with JPMorgan Chase Bank, N.A., as Administrative Agent, and certain lenders. In addition, the Company has no borrowings on its €5.8 million ($6.8 million) available line of credit in Italy as of June 30, 2018. The Company is in compliance with all required financial covenants as of June 30, 2018.