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Balance Sheet Accounts (Schedule of Other Current Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Balance Sheet Related Disclosures [Abstract]    
Deferred revenue $ 385 $ 851
Professional fees 1,012 307
Other accrued expenses 611 490
Total other current liabilities $ 2,008 $ 1,648