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Cash and Cash Equivalents
12 Months Ended
Dec. 31, 2017
Cash and Cash Equivalents [Abstract]  
Cash and Cash Equivalents

3. Cash and Cash Equivalents

Cash and cash equivalents of approximately $24,103 and $56,484 at December 31, 2017 and December 31, 2016, respectively, were held at one financial institution. At December 31, 2017 and December 31, 2016, cash equivalents were approximately $26,548 and $55,619, respectively.