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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosure [Line Items] |  |  |
Increase (decrease) in deferred tax valuation allowance | $ 40,700,000 | $ 9,100,000 |
Unrecognized tax benefits that would affect the effective tax rate if recognized | 3,900,000 | 3,300,000 | $ 2,800,000
Accrued interest and penalties related to unrecognized tax benefits | 0 | $ 0 | $ 0
Federal Tax Authority [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carryforwards | $ 192,000,000 |  |
Operating loss carryforward expiration year | 2030 |  |
Federal Tax Authority [Member] | Research and Development Tax Credit [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforwards | $ 3,400,000 |  |
Tax credit carryforward expiration year | 2027 |  |
State Tax Authority [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Operating loss carryforward expiration year | 2025 |  |
Other net operating losses | $ 1,100,000 |  |
State Tax Authority [Member] | California |  |  |
Income Tax Disclosure [Line Items] |  |  |
Net operating loss carryforwards | $ 31,100,000 |  |
Operating loss carryforward expiration year | 2030 |  |
State Tax Authority [Member] | Research and Development Tax Credit [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforwards | $ 3,800,000 |  |
State Tax Authority [Member] | Minimum Tax Credit Carryforward [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforwards | $ 200,000 |  |

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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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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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