Quarterly report pursuant to Section 13 or 15(d)

Basis of presentation, principles of consolidation and significant accounting policies - Prepaid Expenses and Other Current Assets (Details)

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Basis of presentation, principles of consolidation and significant accounting policies - Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Prepaid Expense and Other Assets, Current    
Vendor prepayments and deposits $ 1,994 $ 238
Prepaid insurance 560 171
Non-trade receivables 316 56
Other 307 375
Total prepaid expenses and other current assets $ 3,177 $ 840