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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 30, 2016 | Dec. 31, 2015
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Effective income tax rate |  | 21.00% | 34.00% | 34.00% |  |
Tax benefit recognized |  |  | $ 0 | $ 0 |  |
AMT credit carryforwards |  | $ 736,000 |  |  |  |
Provisional tax benefit due to new Tax Act |  | 122,000 |  |  |  |
Untaxed accumulated unremitted foreign earnings |  | 813,000 |  |  |  |
Valuation allowance, deferred tax assets |  | 30,031,000 | 33,024,000 |  |  |
Research and development tax credit carryforwards |  | 23,244,000 | 20,019,000 |  |  |
Accrued interest |  | 1,462,000 | 1,104,000 | 946,000 |  | $ 830,000
Net interest expense |  | 7,000 | 6,000 | $ 6,000 |  |
Potential payment of interest |  | $ 35,000 | $ 29,000 |  |  |
Converpower Corporation [Member] |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Ownership percentage by parent in certain operating assets and cash |  |  |  |  | 100.00% |
Unremitted earnings reversed | $ 55,000 |  |  |  |  |
Maximum [Member] |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Effective income tax rate |  |  | 35.00% |  |  |
Domestic Tax Authority [Member] |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Federal net operating loss carryforwards expiry, beginning year |  | 2033 |  |  |  |
Research and development tax credit carryforwards |  | $ 12,139,000 |  |  |  |
Net operating loss carryforwards |  | $ 2,584,000 |  |  |  |
Certain States [Member] |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Federal net operating loss carryforwards expiry, beginning year |  | 2019 |  |  |  |
Federal net operating loss carryforwards expiry, ending year |  | 2037 |  |  |  |
Research and development tax credit carryforwards |  | $ 14,920,000 |  |  |  |
Net operating loss carryforwards |  | $ 8,249,000 |  |  |  |

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- Definition Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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