XML 52 R28.htm IDEA: XBRL DOCUMENT v3.19.3
Prepaid Expenses and Other Current Assets (Schedule of Prepaid Expenses and Other Current Assets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Prepaid Expense and Other Assets, Current [Abstract]    
Research and development tax credit receivable $ 1,929 $ 1,148
Prepayments and VAT receivable 821 899
Other current assets 119 236
Prepaid expenses and other current assets $ 2,869 $ 2,283