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INCOME TAXES (Summary of Components of Net Deferred Tax Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred Tax Assets    
Allowances and reserves $ (9,689) $ (8,969)
Net operating loss carryforwards 165,408 237,393
Tax credit carryforwards 60,807 67,579
Written-down/amortization of intangible assets and goodwill 1,421 5,554
Fixed assets 3,448 5,997
Demo equipment income 4,415 7,357
Other 13,230 16,352
Total Deferred Tax Assets 239,040 331,263
Deferred Tax Liabilities    
Prepaid expense (29) 736
Accrued warranties 663 (92)
Other (330) (334)
Total Deferred Tax Liabilities 304 310
Total Net Deferred Tax Assets 239,344 331,573
Less: Valuation Allowance (236,332) (329,523)
Total Net Deferred Tax Assets $ 3,012 $ 2,050