Income Taxes - Additional Information (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Income Tax [Line Items]
Deferred tax assets generated from foreign NOLs		$ 67,000	$ 127,000
Net balance of deferred tax asset		3,700,000	5,200,000
Deferred tax asset, valuation allowance	$ 400,000	388,000	5,097,000
U.S. deferred tax assets from operations	700,000	$ 1,322,000	$ 616,000
Deferred tax assets and related valuation allowance written off	700,000
U.S. deferred tax assets, realizable portion of valuation allowance	$ 3,300,000
Earliest Tax Year [Member]
Income Tax [Line Items]
Tax credits expiration year		2020
Latest Tax Year [Member]
Income Tax [Line Items]
Tax credits expiration year		2024
Research and Development Credit Carryforwards [Member]
Income Tax [Line Items]
Tax credit carryforward amount		$ 1,724,000
Research and Development Credit Carryforwards [Member] | Earliest Tax Year [Member]
Income Tax [Line Items]
Tax credit carryforwards expiration year		2020
Research and Development Credit Carryforwards [Member] | Latest Tax Year [Member]
Income Tax [Line Items]
Tax credit carryforwards expiration year		2038
Federal [Member]
Income Tax [Line Items]
Net operating loss carryforwards		$ 5,565,000
Operating loss carryforwards expiration year		2038
State [Member]
Income Tax [Line Items]
Net operating loss carryforwards		$ 6,680,000