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Balance Sheet Accounts (Schedule of Prepaid Expenses and Other Current Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]    
Prepaid maintenance contracts $ 1,937 $ 1,944
Equity issuance costs 294 0
Prepaid insurance 161 490
Prepaid rent 324 311
Prepaid Taxes 1,108 195
Other current assets 1,464 1,365
Prepaid expenses and other current assets $ 5,288 $ 4,305 [1]
[1] As adjusted for the adoption of ASC 606 using the full retrospective method.