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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2022
Income Tax Disclosure [Abstract] |
Schedule of United States and Foreign Income (Loss) Before Income Taxes | United States and foreign income (loss) before income taxes were as follows:
|  | Years Ended December 31, |
|  | 2022 |  |  | 2021 |  |  | 2020 |
|  | (in thousands) |
United States |  | $ | (3,454 | ) |  | $ | (961 | ) |  | $ | (13,225 | )
Foreign |  |  | 515 |  |  |  | (1,573 | ) |  |  | (12,233 | )
|  | $ | (2,939 | ) |  | $ | (2,534 | ) |  | $ | (25,458 | )
Schedule of Components of the (Expense) Benefit for Income Taxes |
|  | Years Ended December 31, |
|  | 2022 |  |  | 2021 |  |  | 2020 |
|  | (in thousands) |
Current |  |  |  |  |  |  |  |  |
Federal |  | $ | — |  |  | $ | (42 | ) |  | $ | 1 |
State |  |  | — |  |  |  | — |  |  |  | — |
Foreign |  |  | 928 |  |  |  | 1,284 |  |  |  | 1,044 |
Total current income tax expense (benefit) |  | $ | 928 |  |  | $ | 1,242 |  |  | $ | 1,045 |
Deferred |  |  |  |  |  |  |  |  |
Federal |  |  | — |  |  |  | — |  |  |  | — |
State |  |  | — |  |  |  | — |  |  |  | — |
Foreign |  |  | 1,135 |  |  |  | 2,052 |  |  |  | (2,827 | )
Total deferred tax expense (benefit) |  | $ | 1,135 |  |  | $ | 2,052 |  |  | $ | (2,827 | )
Total income tax expense (benefit) |  | $ | 2,063 |  |  | $ | 3,294 |  |  | $ | (1,782 | )
Summary of Unrecognized Tax Benefits |
|  | Years Ended December 31, |
|  | 2022 |  |  | 2021 |  |  | 2020 |
|  | (in thousands) |
Beginning balance-gross unrecognized tax benefits (UTB’s) |  | $ | 3,244 |  |  | $ | 3,404 |  |  | $ | 15,507 |
Tax credit expiration |  |  | — |  |  |  | (160 | ) |  |  | (12,103 | )
Ending balance—UTB |  |  | 3,244 |  |  |  | 3,244 |  |  |  | 3,404 |
UTB’s as a credit in deferred taxes |  |  | (2,347 | ) |  |  | (2,347 | ) |  |  | (2,347 | )
Federal benefit of state taxes |  |  | (356 | ) |  |  | (356 | ) |  |  | (516 | )
UTB’s that would impact the effective tax rate |  | $ | 541 |  |  | $ | 541 |  |  | $ | 541 |
Summary of the Components of Net Deferred Tax Assets |
|  | December 31, |  |  | December 31, |
|  | 2022 |  |  | 2021 |
|  | (in thousands) |
Deferred Tax Assets |  |  |  |  |  |
Allowance and reserves |  | $ | 2,432 |  |  | $ | 3,811 |
Net operating loss carryforward |  |  | 168,691 |  |  |  | 167,844 |
Tax credit carryforwards |  |  | 6,093 |  |  |  | 6,451 |
Property, plant and equipment |  |  | 310 |  |  |  | 396 |
Stock-based compensation |  |  | — |  |  |  | 29 |
Accrued warranties |  |  | 13 |  |  |  | 12 |
Other |  |  | 13,624 |  |  |  | 14,052 |
Total deferred tax assets |  |  | 191,163 |  |  |  | 192,595 |
Deferred Tax Liabilities |  |  |  |  |  |
Deferred revenue and customer advances, net |  |  | (87 | ) |  |  | (88 | )
Prepaid expense |  |  | (41 | ) |  |  | (42 | )
Total deferred tax liabilities |  |  | (128 | ) |  |  | (130 | )
Total net deferred tax assets |  |  | 191,035 |  |  |  | 192,465 |
Less: Valuation allowance |  |  | (190,198 | ) |  |  | (190,334 | )
Total net deferred tax assets |  | $ | 837 |  |  | $ | 2,131 |
Schedule of Reconciliation of Effective Income Tax Amount and the Federal Statutory Amount |
|  | Years Ended December 31, |
|  | 2022 |  |  | 2021 |  |  | 2020 |
|  | (in thousands) |
Federal tax (benefit) at statutory rate |  | $ | (617 | ) |  | $ | (532 | ) |  | $ | (5,388 | )
Stock compensation expense |  |  | 127 |  |  |  | 68 |  |  |  | 148 |
Effect of differences in foreign tax rates |  |  | 1,117 |  |  |  | 1,715 |  |  |  | (1,408 | )
ASC 740-10 reserve |  |  | 21 |  |  |  | (21 | ) |  |  | 22 |
Change in deferred tax valuation allowance |  |  | 1,394 |  |  |  | 1,273 |  |  |  | 4,334 |
Other |  |  | 21 |  |  |  | 791 |  |  |  | 510 |
Total Tax Expense (Benefit) |  | $ | 2,063 |  |  | $ | 3,294 |  |  | $ | (1,782 | )

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