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Balance Sheet Accounts (Schedule of Prepaid Expenses and Other Current Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Balance Sheet Related Disclosures [Abstract]    
Prepaid maintenance contracts (current) $ 1,944 $ 2,026
Prepaid insurance 490 541
Prepaid rent 311 370
Other assets (current) 1,560 1,140
Prepaid expenses and other current assets [1] $ 4,305 $ 4,077
[1] As adjusted for the adoption of ASC 606 using the full retrospective method