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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Schedule of United States and foreign income (loss) before income taxes and minority interest |
|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | (in thousands) |
United States |  | $ | 13,381 |  |  | $ | (29,673 | ) |  | $ | 7,905 |
Foreign |  |  | (8,939 | ) |  |  | 37,917 |  |  |  | (6,985 | )
|  | $ | 4,442 |  |  | $ | 8,244 |  |  | $ | 920 |
Schedule of components of the provision (benefit) for income taxes |
|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | (in thousands) |
Current |  |  |  |  |  |  |  |  |
Federal |  | $ | — |  |  | $ | — |  |  | $ | — |
State |  | — |  |  | — |  |  | — |
Foreign |  | $ | (890 | ) |  | $ | 2,355 |  |  | 17 |
Total Current |  | $ | (890 | ) |  | $ | 2,355 |  |  | $ | 17 |
Deferred |  |  |  |  |  |  |  |  |
Federal |  | — |  |  | — |  |  | — |
State |  | — |  |  | — |  |  | — |
Foreign |  | 512 |  |  | (1,092) |  |  | 771 |
Total Deferred |  | 512 |  |  | (1,092) |  |  | 771 |
Total |  | $ | (378 | ) |  | $ | 1,263 |  |  | $ | 788 |
Summary of unrecognized tax benefits |
|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | (in thousands) |
Beginning balance-gross unrecognized tax benefits (UTB’s) |  | $ | 18,728 |  |  | $ | 20,137 |  |  | $ | 22,694 |
Lapse of statute of limitations |  |  | (1,232 | ) |  |  | (1,409 | ) |  |  | (2,557 | )
Ending balance—UTB |  |  | 17,496 |  |  |  | 18,728 |  |  |  | 20,137 |
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 |  | $ | 829 |  |  | $ | 2,061 |  |  | $ | 3,470 |
Summary of the components of net deferred tax assets |
|  | December 31, |  |  | December 31, |
|  | 2018 |  |  | 2017 |
|  | (in thousands) |
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 |
Schedule of reconciliation of effective income tax amount and the federal statutory amount |
|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | (in thousands) |
Federal tax (benefit) at statutory rate |  | $ | 1,120 |  |  | $ | 2,885 |  |  | $ | 322 |
Stock compensation expense |  |  | 184 |  |  |  | 295 |  |  |  | 463 |
Effect of differences in foreign tax rates |  |  | 2,113 |  |  |  | (6,793 | ) |  |  | 4,475 |
Summary of Interpretation No. 48 (“Fin 48”) Reserve |  |  | (1,230 | ) |  |  | (1,478 | ) |  |  | (2,465 | )
Change in deferred tax valuation allowance |  |  | (1,679 | ) |  |  | 5,971 |  |  |  | (3,015 | )
Other |  |  | (886 | ) |  |  | 383 |  |  |  | 1,008 |
Total Tax Expense |  | $ | (378 | ) |  | $ | 1,263 |  |  | $ | 788 |

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