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Balance Sheet Accounts (Schedule of Other Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]    
Capitalized software project costs $ 8,308 $ 4,481
Security deposits 483 545
Debt issuance costs - non-current 1,099 0
Deferred tax assets 232 232
Income tax receivable 913 1,826
Other assets 241 203
Other assets $ 11,276 $ 7,287