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Concentrations of Credit Risk	12 Months Ended
Concentrations of Credit Risk	Dec. 31, 2016
Concentrations of Credit Risk
Concentrations of Credit Risk	18. Concentrations of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents held. The Company maintains cash and cash equivalents with various financial institutions. Cash deposits maintained at financial institutions may exceed the federally insured limit.