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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	14. Subsequent Events On March 2, 2018, the Company amended the task order pursuant and subject to the terms of the Master Services Agreement, dated April 26, 2012, as amended on December 31, 2015, with Medpace, Inc., a clinical research organization conducting global clinical research for the development of drugs and medical devices, to reduce the retainer from $1.3 million to $0.3 million. The retainer is currently recorded as prepaids and other current assets on the Company’s consolidated balance sheets.