Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Narrative) (Details)

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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Income Taxes [Abstract]    
Discrete charge for an uncertain tax position $ 12  
Discrete charge associated with disproportionate tax effect $ 133  
Foreign statutory tax rate, foreign operations 25.00%  
Gross deferred tax asset   $ 75,416
Valuation allowance   67,662
Net deferred tax asset   7,754
Deferred tax liabilities, gross   16,720
Net operating loss carryforwards for U.S. federal income tax purposes   172,419
Tax windfall   270
Research and experimentation credit carryforwards   3,407
Alternative minimum tax credit carryforwards   $ 315
AMT percentage   20.00%
Maximum percentage of income offset by available NOLs   90.00%
Net operating loss carryforwards, net of limitations   $ 172,149