Annual report pursuant to Section 13 and 15(d)

Accrued Expenses and Warrant Liability - Accrued Expenses (Details)

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Accrued Expenses and Warrant Liability - Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Compensation $ 336 $ 1,233
Other 58 70
Total $ 394 $ 1,303