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INCOME TAXES - Additional Information (Details) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 27, 2020 | Oct. 11, 2014 | Jan. 01, 2008 | Dec. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
INCOME TAXES |  |  |  |  |  |
Ending balance—gross unrecognized tax benefits (“UTB”s) |  |  |  | $ 3,404 | $ 15,507 | $ 17,496
Unrecognized tax benefits if recognized, would impact certain deferred tax assets |  |  |  | 2,900 |  |
Unrecognized tax benefits that would impact the annual effective tax rate if recognized |  |  |  | 541 | 540 | 829
Decrease in provision for income taxes due to reduction of gross unrecognized tax benefits |  |  |  | 12,100 |  |
Accrued interest and penalties |  |  |  | 500 | 400 |
Change in deferred tax valuation allowance |  |  |  | 4,334 | 1,107 | (1,679)
Income tax benefit related to tax credits |  |  |  | 0 | $ 0 | $ 0
U.S Federal |  |  |  |  |  |
INCOME TAXES |  |  |  |  |  |
Net operating loss carryforwards |  |  |  | 563,000 |  |
Valuation allowance against the related deferred tax assets |  |  |  | 3,800 |  |
U.S Federal | Research and development credit carryforwards |  |  |  |  |  |
INCOME TAXES |  |  |  |  |  |
Tax credit carryforwards |  |  |  | 1,200 |  |
Tax Credit Carry Forward Amount Not Subject To Expiration |  |  |  | 6,400 |  |
Tax Credit Carry Forward Amount Subject To Expiration |  |  |  | 1,200 |  |
State |  |  |  |  |  |
INCOME TAXES |  |  |  |  |  |
Net operating loss carryforwards |  |  |  | 246,000 |  |
U.S Federal and State |  |  |  |  |  |
INCOME TAXES |  |  |  |  |  |
Valuation allowance against the related deferred tax assets |  |  |  | 132,700 |  |
Foreign |  |  |  |  |  |
INCOME TAXES |  |  |  |  |  |
Tax credit carryforwards |  |  |  | $ 6,880 |  |
Earliest Tax Year | U.S Federal |  |  |  |  |  |
INCOME TAXES |  |  |  |  |  |
Operating loss carryforwards expiration year |  |  |  | 2025 |  |
Tax credit carryforward expiration year |  |  |  | 2021 |  |
Earliest Tax Year | U.S Federal | Research and development credit carryforwards |  |  |  |  |  |
INCOME TAXES |  |  |  |  |  |
Tax credit carryforward expiration year |  |  |  | 2021 |  |
Earliest Tax Year | State |  |  |  |  |  |
INCOME TAXES |  |  |  |  |  |
Operating loss carryforwards expiration year |  |  |  | 2021 |  |
Latest Tax Year | U.S Federal |  |  |  |  |  |
INCOME TAXES |  |  |  |  |  |
Operating loss carryforwards expiration year |  |  |  | 2037 |  |
Tax credit carryforward expiration year |  |  |  | 2028 |  |
Latest Tax Year | U.S Federal | Research and development credit carryforwards |  |  |  |  |  |
INCOME TAXES |  |  |  |  |  |
Tax credit carryforward expiration year |  |  |  | 2023 |  |
Latest Tax Year | State |  |  |  |  |  |
INCOME TAXES |  |  |  |  |  |
Operating loss carryforwards expiration year |  |  |  | 2033 |  |
CARES Act |  |  |  |  |  |
INCOME TAXES |  |  |  |  |  |
NOL carryovers and carrybacks percentage | 100.00% |  |  |  |  |
NOL taxable years to generate a refund of previously paid income taxes | 5 years |  |  |  |  |
CAYMAN ISLANDS |  |  |  |  |  |
INCOME TAXES |  |  |  |  |  |
Withholding tax |  |  |  | $ 0 |  |
China |  |  |  |  |  |
INCOME TAXES |  |  |  |  |  |
Foreign statutory tax rate (as a percent) |  |  |  | 25.00% |  |
Reduced tax rate for qualified high technology enterprises (as a percent) |  |  |  | 15.00% |  |
China | U T Starcom Telecom Co Ltd |  |  |  |  |  |
INCOME TAXES |  |  |  |  |  |
Reduced tax rate for qualified high technology enterprises (as a percent) |  | 15.00% | 15.00% |  |  |
Number of subsidiaries approved for the reduced tax rate | item |  |  |  | 1 |  |
Valid period for reduced income tax rate applicable to qualified high technology enterprise |  | 3 years | 3 years |  |  |
China | Foreign |  |  |  |  |  |
INCOME TAXES |  |  |  |  |  |
Net operating loss carryforwards |  |  |  | $ 114,900 |  |
Valuation allowance against the related deferred tax assets |  |  |  | $ 17,300 |  |
China | Earliest Tax Year | Foreign |  |  |  |  |  |
INCOME TAXES |  |  |  |  |  |
Operating loss carryforwards expiration year |  |  |  | 2024 |  |
China | Latest Tax Year | Foreign |  |  |  |  |  |
INCOME TAXES |  |  |  |  |  |
Operating loss carryforwards expiration year |  |  |  | 2030 |  |
Countries other than the U.S. and China | Foreign |  |  |  |  |  |
INCOME TAXES |  |  |  |  |  |
Net operating loss carryforwards |  |  |  | $ 97,600 |  |
Valuation allowance against the related deferred tax assets |  |  |  | 16,300 |  |
CA | State | Research and development credit carryforwards |  |  |  |  |  |
INCOME TAXES |  |  |  |  |  |
Tax credit carryforwards |  |  |  | $ 6,400 |  |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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