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Other Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Italian VAT receivables $ 4,480 $ 4,692
Italian VAT deposit 493 516
Rent deposit 194 194
Other 380 195
Other assets $ 5,547 $ 5,597