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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes [Line Items] |  |  |
Operating loss carryforwards | $ 1,399 | $ 1,914 |
State incentive tax credit carryforwards | 1,694 | 1,257 |
Valuation allowances | 456 | 108 |
Unrecognized tax benefits | 1,832 | 1,139 | $ 1,065
Potential increase (decrease) in income tax provision | 1,200 | $ 700 |
Income tax interest and penalty recognized | 15 |  |
State [Member] | Net Operating Losses [Member] |  |  |
Income Taxes [Line Items] |  |  |
Valuation allowances | 100 |  |
State [Member] | Tax Incentive Credit Carryforwards [Member] |  |  |
Income Taxes [Line Items] |  |  |
Valuation allowances | $ 300 |  |
Minimum [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carryforwards, expiration date | Dec. 31, 2017 |  |
Tax credit carryforward, expiration date | Dec. 31, 2018 |  |
Possible reduction in unrecognized tax benefits resulting from audit settlements | $ 500 |  |
Maximum [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carryforwards, expiration date | Dec. 31, 2035 |  |
Tax credit carryforward, expiration date | Dec. 31, 2021 |  |
Possible increase in unrecognized tax benefits resulting from audit settlements | $ 500 |  |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + 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 (d)(3) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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