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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2017
INCOME TAXES |
Schedule of United States and foreign income (loss) before income taxes and minority interest |
|  | Years Ended December 31, |
|  | 2017 |  | 2016 |  | 2015 |
|  | (in thousands) |
United States |  | $ | (29,673 | ) | $ | 7,905 |  | $ | 19,717 |
Foreign |  | 37,917 |  | (6,985 | ) | (51,037 | )
|  | $ | 8,244 |  | $ | 920 |  | $ | (31,320 | )
Schedule of components of the provision (benefit) for income taxes |
|  | Years Ended December 31, |
|  | 2017 |  | 2016 |  | 2015 |
|  | (in thousands) |
Current |  |  |  |  |  |  |
Federal |  | $ | — |  | $ | — |  | $ | — |
State |  | — |  | — |  | — |
Foreign |  | $ | 2,355 |  | $ | 17 |  | (5,193 | )
Total Current |  | $ | 2,355 |  | $ | 17 |  | $ | (5,193 | )
Deferred |  |  |  |  |  |  |
Federal |  | — |  | — |  | — |
State |  | — |  | — |  | — |
Foreign |  | (1,092 | ) | 771 |  | 1,031 |
Total Deferred |  | (1,092 | ) | 771 |  | 1,031 |
Total |  | $ | 1,263 |  | $ | 788 |  | $ | (4,162 | )
Summary of unrecognized tax benefits |
|  | Years Ended December 31, |
|  | 2017 |  | 2016 |  | 2015 |
|  | (in thousands) |
Beginning balance-gross unrecognized tax benefits (UTB’s) |  | $ | 20,137 |  | $ | 22,694 |  | $ | 45,382 |
Additions based on tax positions related to the current year |  | — |  | — |  | 48 |
Reductions for tax positions related to prior years |  | — |  | — |  | (835 | )
Lapse of statute of limitations |  | (1,409 | ) | (2,557 | ) | (21,901 | )
Ending balance—gross unrecognized tax benefits (“UTB”s) |  | 18,728 |  | 20,137 |  | 22,694 |
UTB’s as a credit in deferred taxes |  | (14,604 | ) | (14,604 | ) | (14,604 | )
Federal benefit of state taxes |  | (2,063 | ) | (2,063 | ) | (2,063 | )
UTB’s that would impact the effective tax rate |  | $ | 2,061 |  | $ | 3,470 |  | $ | 6,027 |
Summary of the components of net deferred tax assets |
|  | December 31, 2017 |  | December 31, 2016 |
|  | (in thousands) |
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 |
Writedown/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 |
Schedule of reconciliation of effective income tax amount and the federal statutory amount |
|  | Years Ended December 31, |
|  | 2017 |  | 2016 |  | 2015 |
|  | (in thousands) |
Federal tax (benefit) at statutory rate |  | $ | 2,885 |  | $ | 322 |  | $ | (10,962 | )
Stock compensation expense |  | 295 |  | 463 |  | 508 |
Effect of differences in foreign tax rates |  | (6,793 | ) | 4,475 |  | (1,520 | )
FIN48 reserve |  | (1,478 | ) | (2,465 | ) | (7,433 | )
Change in deferred tax valuation allowance |  | 5,971 |  | (3,015 | ) | 14,241 |
Other |  | 383 |  | 1,008 |  | 1,004 |
Total Tax Expense |  | $ | 1,263 |  | $ | 788 |  | $ | (4,162 | )

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