Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Line Items]
Income tax expense (benefit)	$ 29,000	$ 40,000
Statutory rate	21.00%	21.00%
Designed to tax global intangible low taxed income, minimum percentage return on depreciable tangible assets.	10.00%	10.00%
Recognition of interest and penalties as income tax expense	$ 0	$ 0
Gross deferred tax assets	12,968,000	13,651,000
Deferred tax asset, valuation allowance	12,938,000	13,490,000
Deferred tax liabilities	30,000,000	200,000
Net deferred tax assets	0	0
Deferred tax asset	$ 2,900,000	$ 3,500,000
Acquired intangible asset amortization period for tax purpose	15 years	15 years
Domestic deferred tax assets ratable reversal pattern period	10 years
Operating loss and credit carry forward, expiration period	The Company’s net operating losses and credits have a finite life primarily based on the 20-year carryforward rule for federal net operating losses (NOLs) generated through December 31, 2017.
Net operating loss carry forward period	20 years
Percentage of loss carry forwards of current taxable income	80
Period of increase or decrease in unrecognized tax benefits	12 months
Deferred payroll taxes	$ 500,000
Domestic Tax Authority [Member]
Income Tax Disclosure [Line Items]
Deferred tax asset, valuation allowance	12,100,000
Net deferred tax assets	12,100,000	$ 13,100,000
Operating Loss Carry forwards	$ 8,100,000
Operating loss carry forwards expiration year	2031
Operating loss carry forwards expiration year	2037
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]
Income Tax Disclosure [Line Items]
Tax credit carry forwards	$ 1,600,000
Tax credit carry forwards expiration year	2030
Tax credit carry forwards expiration year	2040
Domestic Tax Authority [Member] | 2031 and 2037 [Member]
Income Tax Disclosure [Line Items]
Operating Loss Carry forwards	$ 5,300,000
Foreign [Member]
Income Tax Disclosure [Line Items]
Deferred tax asset, valuation allowance	800,000
Net deferred tax assets	800,000	$ 500,000
Operating Loss Carry forwards	$ 1,000,000.0
Operating loss carry forwards expiration year	2025
Foreign [Member] | Research Tax Credit Carryforward [Member]
Income Tax Disclosure [Line Items]
Tax credit carry forwards	$ 300,000
Tax credit carry forwards expiration year	2024
Tax credit carry forwards expiration year	2026
State and Local Jurisdiction [Member]
Income Tax Disclosure [Line Items]
Operating Loss Carry forwards	$ 15,700,000
Operating loss carry forwards expiration year	2021
Operating loss carry forwards expiration year	2038
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member]
Income Tax Disclosure [Line Items]
Tax credit carry forwards	$ 1,500,000