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Income Taxes - Reconciliation of Statutory Income Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |
Singapore statutory income tax rate | 21.00% | 35.00% |
Singapore [Member] |  |  |
Income Taxes [Line Items] |  |  |
Singapore statutory income tax rate | 17.00% | 17.00% | 17.00%
Federal and state tax credits | 6.60% | 5.70% | 3.10%
Permanent differences | (0.30%) | (2.60%) | (0.90%)
Changes in reserves for uncertain tax positions | (2.30%) | (3.50%) | (3.60%)
Foreign rate differential | 7.80% | 2.80% | (0.10%)
Tax rate change | (0.30%) | (0.90%) |
Other | 0.20% | 0.40% | (0.70%)
Change in deferred tax asset valuation allowance | (28.70%) | (19.70%) | (15.70%)
Effective income tax rate |  | (0.80%) | (0.90%)

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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