XML 57 R48.htm IDEA: XBRL DOCUMENT v3.19.2
Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Prepaid Expense And Other Assets Current [Abstract]      
Insurance premiums $ 175 $ 140 $ 421
Sublease income 127    
Financing costs 80   70
Security deposit 50 51 50
Income tax and VAT receivable 31 579 29
Other 201 128 130
Total prepaid expenses and other current assets $ 664 $ 898 $ 700