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Prepaid Expenses and Other Current Assets
 9 Months Ended
Sep. 30, 2019
Prepaid Expense and Other Assets, Current [Abstract]  
Prepaid Expenses and Other Current Assets Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consisted of the following:
As of September 30, 2019As of December 31, 2018
Prepaid clinical trial costs$4,871  $7,210  
Prepaid insurance839  393  
Other886  487  
 $6,596  $8,090