Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2016	Dec. 31, 2012
Income Taxes [Line Items]
Undistributed earnings of foreign subsidiaries	$ 12,066,000	$ 10,942,000
Foreign tax credit carryforward	232,000	0
Company's gross research and development tax credit carry forwards	2,331,000	1,655,000
Gross research and development tax credit definite carry forward	$ 1,141,000
Period of company's gross research and development tax credit carry forward	15 years
Expiration of company's gross research and development tax credit carry forward, Minimum	2016
Expiration of company's gross research and development tax credit carry forward, Maximum	2016
Gross research and development tax credit indefinite carry forward	$ 1,190,000
Research and development tax credit carryforward	1,276,000	$ 817,000
Gross operating loss carry forwards, State	2,204,000
Gross foreign net operating loss that does not expire	266,000
Net deferred tax taxes more likely than not to be realized	6,094,000
Allowances against gross deferred tax assets	$ 3,594,000
Estimated income tax rate from continuing operations	31.00%	33.00%	25.00%
Examination by IRS	The Company and its subsidiaries file income tax returns in the United States and in various state, local and foreign jurisdictions. The Company and its subsidiaries are occasionally examined by tax authorities in these jurisdictions. The Company has been audited by the Internal Revenue Service (the "IRS") through 2013. State income tax statutes are generally open for periods back to and including the calendar year 2011.
Uncertain tax positions reclassified against related deferred tax assets	$ 366,000
Liability for interest and penalties related to unrecognized tax benefits	118,000	$ 81,000
Liability for unrecognized benefits	926,000	$ 865,000	$ 834,000		$ 595,000
Reduction [Member] | ASC 718 [Member]
Income Taxes [Line Items]
Foreign tax credit carryforward	232,000
Research and development tax credit carryforward	133,000
Equity Increase [Member] | ASC 718 [Member]
Income Taxes [Line Items]
Potential increase in equity if deferred tax asset realized related to equity compensation	365,000
Internal Revenue Service (IRS) [Member] | Scenario, Forecast [Member]
Income Taxes [Line Items]
Refund on settlement with IRS				$ 584,000
Federal Tax [Member]
Income Taxes [Line Items]
Liability for unrecognized benefits	357,000
State Tax [Member]
Income Taxes [Line Items]
Liability for unrecognized benefits	366,000
International Tax [Member]
Income Taxes [Line Items]
Liability for unrecognized benefits	$ 203,000
Minimum [Member]
Income Taxes [Line Items]
Operating loss carry forwards expiration date	2017
Gross unrecognized tax benefits balance	$ 0
Maximum [Member]
Income Taxes [Line Items]
Operating loss carry forwards expiration date	2035
Gross unrecognized tax benefits balance	$ 359,000