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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2015
Income Taxes [Line Items] |  |  |  |
Deferred tax assets from share-based payments | $ 1,079,000 | $ 628,000 |  |
Valuation allowance increase (decrease) | 1,216,000 | $ 727,000 | $ (1,736,000) |
Impact of unrecognized tax benefits on effective tax rate | 1,289,000 |  |  |
Interest and penalties related to uncertain tax positions | 272,000 |  |  |
Earnings of foreign subsidiaries permanently reinvest outside the U.S | 30,322,000 |  |  |
Generated between 2010 and 2011 | Research and Development Credit |  |  |  |
Income Taxes [Line Items] |  |  |  |
Payment to DOR | 141,000 |  |  |
Tax Period Two Thousand Eight to Two Thousand Nine |  |  |  |
Income Taxes [Line Items] |  |  |  |
Payment to DOR | $ 1,012,000 |  |  |
Liability for an uncertain tax position |  |  |  | $ 926,000
Maximum |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss and business tax credit carry forwards expiration date | At various dates through December 2035 |  |  |
Available to Reduce Future Federal Income Taxes |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carry forwards | $ 46,984,000 |  |  |
Business tax credit carry forwards | 1,920,000 |  |  |
Deferred tax assets from share-based payments | 10,242,000 |  |  |
Reserves for business tax credits | 1,289,000 |  |  |
Available to Reduce Future Federal Income Taxes | General Business Tax Credit Carryforward |  |  |  |
Income Taxes [Line Items] |  |  |  |
Business tax credit carry forwards | $ 2,578,000 |  |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 + Details
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