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Cash and Cash Equivalents
6 Months Ended
Jun. 30, 2018
Cash and Cash Equivalents [Abstract]  
Cash and Cash Equivalents

4. Cash and Cash Equivalents

Cash and cash equivalents of approximately $31,805 and $24,103 at June 30, 2018 and December 31, 2017, respectively, were held at one financial institution. At June 30, 2018 and December 31, 2017, cash equivalents were approximately $4,701 and $26,548, respectively.