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INCOME TAXES - Additional Information (Details) |  |  | 12 Months Ended
--- | --- | --- | ---
Oct. 11, 2014 | Jan. 01, 2008 | Dec. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
INCOME TAXES |  |  |  |  |
Statutory tax rate (as a percent) |  |  | 21.00% | 21.00% | 35.00%
Refundable alternative minimum tax credit carryovers |  |  |  | $ 1,000,000 |
GILTI inclusion amount |  |  | $ 0 |  |
GILTI income tax liabilities |  |  | 0 |  |
Ending balance—gross unrecognized tax benefits (“UTB”s) |  |  | 15,507,000 | 17,496,000 | $ 18,728,000
Unrecognized tax benefits if recognized, would impact certain deferred tax assets |  |  | 15,000,000 |  |
Unrecognized tax benefits that would impact the annual effective tax rate if recognized |  |  | 540,000 | 829,000 | 2,061,000
Decrease in provision for income taxes due to reduction of gross unrecognized tax benefits |  |  | 2,000,000 |  |
Accrued interest and penalties |  |  | 400,000 | 400,000 |
Change in deferred tax valuation allowance |  |  | 1,107,000 | (1,679,000) | 5,971,000
Income tax benefit related to tax credits |  |  | 0 | 0 | $ 0
U.S Federal |  |  |  |  |
INCOME TAXES |  |  |  |  |
Net operating loss carryforwards |  |  | 562,000,000 |  |
Valuation allowance against the related deferred tax assets |  |  | 2,500,000 |  |
U.S Federal | Research and development credit carryforwards |  |  |  |  |
INCOME TAXES |  |  |  |  |
Tax credit carryforwards |  |  | 3,100,000 |  |
Tax Credit Carry Forward Amount Not Subject To Expiration |  |  | 2,500,000 |  |
Tax Credit Carry Forward Amount Subject To Expiration |  |  | 600,000 |  |
State |  |  |  |  |
INCOME TAXES |  |  |  |  |
Net operating loss carryforwards |  |  | 277,000,000 |  |
U.S Federal and State |  |  |  |  |
INCOME TAXES |  |  |  |  |
Valuation allowance against the related deferred tax assets |  |  | 134,600,000 |  |
Foreign |  |  |  |  |
INCOME TAXES |  |  |  |  |
Tax credit carryforwards |  |  | 5,600,000 |  |
Tax Year 2018 |  |  |  |  |
INCOME TAXES |  |  |  |  |
Alternative minimum tax credit carryovers refundable credits claimed |  |  |  | $ 500,000 |
Tax Year 2019 |  |  |  |  |
INCOME TAXES |  |  |  |  |
Alternative minimum tax credit carryovers refundable credits claimed |  |  | $ 500,000 |  |
Earliest Tax Year | U.S Federal |  |  |  |  |
INCOME TAXES |  |  |  |  |
Operating loss carryforwards expiration year |  |  | 2025 |  |
Tax credit carryforward expiration year |  |  | 2020 |  |
Earliest Tax Year | U.S Federal | Research and development credit carryforwards |  |  |  |  |
INCOME TAXES |  |  |  |  |
Tax credit carryforward expiration year |  |  | 2020 |  |
Earliest Tax Year | State |  |  |  |  |
INCOME TAXES |  |  |  |  |
Operating loss carryforwards expiration year |  |  | 2020 |  |
Latest Tax Year | U.S Federal |  |  |  |  |
INCOME TAXES |  |  |  |  |
Operating loss carryforwards expiration year |  |  | 2034 |  |
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 |  |  | 2039 |  |
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 |  |  | $ 77,800,000 |  |
Valuation allowance against the related deferred tax assets |  |  | $ 11,800,000 |  |
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 |  |  | 2029 |  |
Countries other than the U.S. and China | Foreign |  |  |  |  |
INCOME TAXES |  |  |  |  |
Net operating loss carryforwards |  |  | $ 97,800,000 |  |
Valuation allowance against the related deferred tax assets |  |  | $ 16,400,000 |  |

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