Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Narrative) (Details)

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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Income Taxes [Abstract]    
Foreign statutory tax rate, foreign operations 25.00%  
Gross deferred tax asset   $ 47,922
Valuation allowance   42,122
Net deferred tax asset   5,800
Deferred tax liabilities, gross   8,719
Net operating loss carryforwards for U.S. federal income tax purposes   141,067
Research and experimentation credit carryforwards   $ 3,791