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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Tax Disclosure [Abstract] |
Schedule of United States and Foreign Income (Loss) Before Income Taxes and Minority Interest |
|  | Years Ended December 31, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
|  | (in thousands) |
United States |  | $ | 6,647 |  |  | $ | 13,381 |  |  | $ | (29,673 | )
Foreign |  |  | (10,591 | ) |  |  | (8,939 | ) |  |  | 37,917 |
|  | $ | (3,944 | ) |  | $ | 4,442 |  |  | $ | 8,244 |
Schedule of Components of the Provision (Benefit) for Income Taxes |
|  | Years Ended December 31, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
|  | (in thousands) |
Current |  |  |  |  |  |  |  |  |
Federal |  |  | (984 | ) |  | $ | — |  |  | $ | — |
State |  | — |  |  | — |  |  | — |
Foreign |  |  | 150 |  |  | $ | (890 | ) |  | 2,355 |
Total current income tax expense (benefit) |  | $ | (834 | ) |  | $ | (890 | ) |  | $ | 2,355 |
Deferred |  |  |  |  |  |  |  |  |
Federal |  | — |  |  | — |  |  | — |
State |  | — |  |  | — |  |  | — |
Foreign |  | 803 |  |  | 512 |  |  | (1,092) |
Total deferred tax expense (benefit) |  | 803 |  |  | 512 |  |  | (1,092) |
Total income tax expense (benefit) |  | $ | (31 | ) |  | $ | (378 | ) |  | $ | 1,263 |
Summary of Unrecognized Tax Benefits |
|  | Years Ended December 31, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
|  | (in thousands) |
Beginning balance-gross unrecognized tax benefits (UTB’s) |  | $ | 17,496 |  |  | $ | 18,728 |  |  | $ | 20,137 |
Lapse of statute of limitations |  |  | (291 | ) |  |  | (1,232 | ) |  |  | (1,409 | )
Rate change impact |  |  | (1,698 | ) |  |  | — |  |  |  | — |
Ending balance—UTB |  |  | 15,507 |  |  |  | 17,496 |  |  |  | 18,728 |
UTB’s as a credit in deferred taxes |  |  | (12,905 | ) |  |  | (14,604 | ) |  |  | (14,604 | )
Federal benefit of state taxes |  |  | (2,062 | ) |  |  | (2,063 | ) |  |  | (2,063 | )
UTB’s that would impact the effective tax rate |  | $ | 540 |  |  | $ | 829 |  |  | $ | 2,061 |
Summary of the Components of Net Deferred Tax Assets |
|  | December 31, |  |  | December 31, |
|  | 2019 |  |  | 2018 |
|  | (in thousands) |
Deferred Tax Assets |  |  |  |  |  |
Allowance and reserves |  | $ | 2,935 |  |  | $ | (10,671 | )
Prepaid expense |  |  | 95 |  |  |  | 28 |
Net operating loss carryforward |  |  | 162,712 |  |  |  | 164,512 |
Tax credit carryforwards |  |  | 5,660 |  |  |  | 32,958 |
Writedown/amortization of intangible assets and goodwill |  |  | 15 |  |  |  | 241 |
Property, plant and equipment |  |  | 4,147 |  |  |  | 3,500 |
Demo equipment income |  |  | 4,588 |  |  |  | 4,439 |
Accrued warranties |  |  | 25 |  |  |  | (302 | )
Other |  |  | 15,193 |  |  |  | 14,205 |
Total deferred tax assets |  |  | 195,370 |  |  |  | 208,910 |
Deferred Tax Liabilities |  |  |  |  |  |
Deferred revenue and customer advances, net |  |  | (157 | ) |  |  | 27 |
Total deferred tax liabilities |  | (157) |  |  | 27 |
Total net deferred tax assets |  |  | 195,213 |  |  |  | 208,937 |
Less: Valuation Allowance |  |  | (193,788 | ) |  |  | (206,630 | )
Total net deferred tax assets |  | $ 1,425 |  |  | $ 2,307 |
Schedule of Reconciliation of Effective Income Tax Amount and the Federal Statutory Amount |
|  | Years Ended December 31, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
|  | (in thousands) |
Federal tax (benefit) at statutory rate |  | $ | (858 | ) |  | $ | 1,120 |  |  | $ | 2,885 |
Stock based compensation expense |  |  | 132 |  |  |  | 184 |  |  |  | 295 |
Effect of differences in foreign tax rates |  |  | 547 |  |  |  | 2,113 |  |  |  | (6,793 | )
FIN48 reserve |  |  | (349 | ) |  |  | (1,230 | ) |  |  | (1,478 | )
Change in deferred tax valuation allowance |  |  | 1,107 |  |  |  | (1,679 | ) |  |  | 5,971 |
Other |  |  | (610 | ) |  |  | (886 | ) |  |  | 383 |
Total tax expense (benefit) |  | $ | (31 | ) |  | $ | (378 | ) |  | $ | 1,263 |

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