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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |  |  |
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2007
Income Tax [Line Items] |  |  |  |
Gross federal R&D tax credit-related deferred tax assets derecognized | $ 6,100,000 |  |  |
Unrecognized tax benefit | 1,573,000 | $ 1,475,000 | $ 1,539,000 |
Tax-related penalties or interest recognized | 0 | 0 |  |
Uncertain tax positions | 0 | $ 0 |  |
Federal Income Tax |  |  |  |
Income Tax [Line Items] |  |  |  |
Net operating loss carryforwards | $ 112,100,000 |  |  | $ 80,100,000
Net operating loss carryforwards expiration year | 2032 |  |  |
Tax credit carryforwards available to offset future federal tax liabilities | $ 200,000 |  |  |
Credit carryforward, expire period | Dec. 31, 2037 |  |  |
Net operating loss carryforward,derecognized | $ 16,800,000 |  |  |
State Income Tax |  |  |  |
Income Tax [Line Items] |  |  |  |
Net operating loss carryforwards | $ 64,600,000 |  |  |
Net operating loss carryforwards expiration year | 2028 |  |  |
Tax credit carryforwards available to offset future federal tax liabilities | $ 4,500,000 |  |  |
CALIFORNIA |  |  |  |
Income Tax [Line Items] |  |  |  |
Net operating loss carryforwards | 14,200,000 |  |  |
Net operating loss carryforward,derecognized | $ 0 |  |  |

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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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