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
Mar. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]    
Vendor prepayments and deposits $ 1,372 $ 1,857
Prepaid insurance 150 352
Non-trade receivables 1 1
Related party receivables 0 10
Other current assets 615 529
Total prepaid expenses and other current assets $ 2,138 $ 2,749