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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Taxes Disclosure [Line Items] |  |  |  |
Federal income tax rate | 34.00% | 34.00% | 34.00% |
Increase in valuation allowance | $ 6,200,000 | $ 3,700,000 |  |
Unrecognized tax benefit would impact the effective tax rate | 2,600,000 |  |  |
Unrecognized tax benefit | 5,252,000 | 2,431,000 | $ 2,054,000 | $ 2,196,000
Accrued interest and penalties related to unrecognized tax benefits | 300,000 | $ 0 | $ 0 |
Domestic Federal [Member] |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Net operating loss carryforwards | $ 198,200,000 |  |  |
Operating loss carryforwards, expiration year | 2018 |  |  |
Tax credit carryforwards | $ 3,900,000 |  |  |
Tax credit carryforwards, expiration year | 2021 |  |  |
Domestic State [Member] |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Net operating loss carryforwards | $ 102,100,000 |  |  |
Operating loss carryforwards, expiration year | 2017 |  |  |
Domestic State [Member] | California [Member] |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Tax credit carryforwards | $ 4,800,000 |  |  |
Foreign [Member] |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Net operating loss carryforwards | $ 2,400,000 |  |  |
Statutes of limitation for income tax returns start year | 4 years |  |  |
Statutes of limitation for income tax returns end year | 6 years |  |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 + Details
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