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Income Taxes - (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current: |  |  |  |
State |  | $ 2,000 | $ 4,000 | $ 2,000
Foreign |  | 790,000 | 729,000 | 529,000
Total current |  | 792,000 | 733,000 | 531,000
Total net provision for income taxes |  | $ 792,000 | $ 733,000 | $ 531,000
Reconciliation of effective income tax rates and U.S. statutory federal income tax rate [Abstract] |  |  |  |
Statutory federal income tax rate (as a percent) |  | 35.00% | 35.00% | 35.00%
Valuation allowance (as a percent) |  | (139.50%) | (7.10%) | (48.20%)
Rate change (as a percent) |  | 100.80% |  |
Stock-based compensation (as a percent) |  | (10.40%) | 1.20% | (9.80%)
Foreign tax rate differential (as a percent) |  | (10.30%) | (12.20%) | 30.60%
Foreign income tax incentive (as a percent) |  | (7.00%) | (13.60%) | 25.20%
Dividend from unconsolidated affiliates (as a percent) |  |  | 1.50% | (60.40%)
965(a) inclusion (as a percent) |  | 55.60% |  |
Section 78 gross up |  | 11.70% |  |
Foreign tax credit (as a percent) |  | (30.60%) |  |
Tax effect in equity method loss or gain from unconsolidated affiliates (as a percent) |  | 2.90% | 8.30% | 1.20%
Others (as a percent) |  | (0.90%) | (0.20%) | (0.10%)
Effective tax rate (as a percent) |  | 7.30% | 12.90% | (26.50%)
Deferred tax assets [Abstract] |  |  |  |
Net operating loss |  | $ 14,203,000 | $ 62,459,000 |
Accruals and reserves not yet deductible |  | 3,133,000 | 4,520,000 |
Credits |  | 4,809,000 | 1,488,000 |
Deferred tax assets, gross |  | 22,145,000 | 68,467,000 |
Net deferred tax assets |  | 22,145,000 | 68,467,000 |
Valuation allowance |  | (22,145,000) | (68,467,000) |
Reconciliation of beginning and ending amount of the gross unrecognized tax benefits [Roll Forward] |  |  |  |
Gross unrecognized tax benefits beginning balance | $ 14,557,000 | 14,557,000 | 14,557,000 | $ 16,403,000
Decrease related to lapse of statute of limitations |  |  |  | (1,846,000)
Gross unrecognized tax benefits ending balance |  | 14,557,000 | 14,557,000 | 14,557,000
Increase (decrease) in valuation allowance |  | (46,300,000) | 2,700,000 |
Non-U.S. income included in income (loss) before tax |  | 6,400,000 | 15,000,000 | 15,200,000
Unrecognized tax benefits interest and penalties |  | 0 |  |
Unrecognized tax benefits accrued interest and penalties |  | $ 0 |  |
Realized benefits of tax rate reduction (as a percent) |  | 10.00% |  |
One time transition tax rate impact on cash assets (as a percent) |  | 15.50% |  |
One time transition tax rate impact on specific assets (as a percent) |  | 8.00% |  |
Tax reform, accumulated foreign earnings tax provision |  | $ 20,900,000 |  |
Tax reform, alternate minimum tax |  | 500,000 |  |
Net impact of tax reform |  | 0 |  |
Tax reform, change in net deferred tax assets |  | 10,900,000 |  |
Tax reform, change in valuation allowance |  | 10,900,000 |  |
Unrecognized tax benefit would favorably impact the effective tax rate in future periods if recognized |  | 14,600,000 |  |
Forecast |  |  |  |
Reconciliation of effective income tax rates and U.S. statutory federal income tax rate [Abstract] |  |  |  |
Statutory federal income tax rate (as a percent) | 21.00% |  |  |
Domestic Tax Authority |  |  |  |
Reconciliation of beginning and ending amount of the gross unrecognized tax benefits [Roll Forward] |  |  |  |
Operating loss carryforwards |  | 63,600,000 |  |
Tax credit carryforwards |  | 1,500,000 |  |
State |  |  |  |
Reconciliation of beginning and ending amount of the gross unrecognized tax benefits [Roll Forward] |  |  |  |
Operating loss carryforwards |  | $ 300,000 |  |
Foreign Tax Authority |  |  |  |
Reconciliation of beginning and ending amount of the gross unrecognized tax benefits [Roll Forward] |  |  |  |
EIT income tax rate (as a percent) |  | 25.00% |  |
Preferential tax rate (as a percent) |  | 15.00% |  |
Benefit from foreign tax rate |  | $ 599,000,000 | $ 489,000,000 | $ 354,000,000
Renewal Period For Favorable Tax Rate |  | 3 years |  |

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