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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Prepaid Expense And Other Assets Current [Abstract]
Outside consultants	$ 249
Taxes receivable	145	$ 29
Insurance premiums	52	421
Security deposit	51	50
Software	19	15
Financing costs		70
Other	11	115
Total prepaid expenses and other current assets	$ 527	$ 700

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Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

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