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INCOME TAXES (Summary of Components of Net Deferred Tax Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred Tax Assets    
Net operating loss carryforward $ 237,393 $ 215,737
Tax credit carryforwards 67,579 60,385
Capital loss carryforwards   3,742
Written-down/amortization of intangible assets and goodwill 5,554 8,051
Fixed assets 5,997 4,428
Demo equipment income 7,357 7,071
Prepaid expense 736 126
Accrued warranties (92) 1,230
Other 16,352 38,878
Total Deferred Tax Assets 340,876 339,648
Deferred Tax Liabilities    
Allowances and reserves (8,969) (8,254)
Other (335) (278)
Total Deferred Tax Liabilities (9,304) (8,532)
Total Deferred Tax Assets 331,572 331,116
Less: Valuation Allowance (329,523) (328,397)
Net Deferred Tax Assets $ 2,049 $ 2,719