Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax [Line Items]
Recognized tax expense on remeasurement of certain deferred tax assets and liabiliites		$ 1,662,000
U.S. corporate income tax	21.00%	34.00%
Recognized provisional tax expense on transition tax for repatriation of foreign earnings		$ 565,000
Computation of one-time tax based on liquid asset period		3 years
Tax expense impacted by cash and other liquid assets		15.50%
Tax expense impacted by non-cash E&P		8.00%
Income (loss) before income taxes from domestic operations	$ 972,000	$ (65,000)
Profit before income taxes from foreign operations	598,000	284,000
Net deferred tax assets	127,000	$ 173,000
Research and Development Credit Carryforwards [Member]
Income Tax [Line Items]
Tax credit carryforward amount	$ 1,598,000
Research and Development Credit Carryforwards [Member] | Minimum [Member]
Income Tax [Line Items]
Expiration year	2020
Research and Development Credit Carryforwards [Member] | Maximum [Member]
Income Tax [Line Items]
Expiration year	2038
Foreign Tax Credit Carryforward [Member]
Income Tax [Line Items]
Tax credit carryforward amount	$ 368,000
Foreign Tax Credit Carryforward [Member] | Minimum [Member]
Income Tax [Line Items]
Expiration year	2019
Foreign Tax Credit Carryforward [Member] | Maximum [Member]
Income Tax [Line Items]
Expiration year	2020
Federal [Member]
Income Tax [Line Items]
Net operating loss carryforwards	$ 9,429,000
Expiration year	2038
State [Member]
Income Tax [Line Items]
Net operating loss carryforwards	$ 15,906,000
Expiration year	2038