Derivative Financial Instruments - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative [Line Items]
Settlement of forward foreign currency exchange contract in the aggregate notional amount of Swiss francs				$ 246,000	$ 56,000
Gain (loss) on derivative instruments		$ 0	$ 45,566	60,558	$ 45,566
Foreign Currency Derivative Contracts [Member]
Derivative [Line Items]
Settlement of forward foreign currency exchange contract in the aggregate notional amount of Swiss francs	$ 3,300,000			$ 0