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INCOME TAXES (Summary of Components of Net Deferred Tax Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred Tax Assets    
Deferred revenue and customer advances, net $ 27 $ 663
Prepaid expense 28  
Net operating loss carryforward 164,512 165,408
Tax credit carryforwards 32,958 60,807
Writedown/amortization of intangible assets and goodwill 241 1,421
Fixed assets 3,500 3,448
Demo equipment income 4,439 4,415
Other 14,205 13,230
Total Deferred Tax Assets 219,910 249,392
Deferred Tax Liabilities    
Prepaid expense   (29)
Allowance and reserves (10,671) (9,689)
Accrued warranties (302) (330)
Total Deferred Tax Liabilities (10,973) (10,048)
Total Net Deferred Tax Assets 208,937 239,344
Less: Valuation Allowance (206,630) (236,332)
Total Net Deferred Tax Assets $ 2,307 $ 3,012