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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Significant Accounting Policies [Line Items]
Maximum maturity period of highly liquid investments	3 months
Allowances for doubtful accounts	$ 749,000	$ 711,000
Accruals for premium deficiency	0	0
Fair value, assets, level 1 to level 2 transfers	0	0
Fair value, assets, level 2 to level 1 transfers	0	0
Fair value, liabilities, level 1 to level 2 transfers	0	0
Fair value, liabilities, level 2 to level 1 transfers	$ 0	$ 0
Software [Member]
Schedule Of Significant Accounting Policies [Line Items]
Useful life of property and equipment	3 years
Minimum [Member]
Schedule Of Significant Accounting Policies [Line Items]
Short-term investment maturity period	3 months
Useful life of property and equipment	3 years
Maximum [Member]
Schedule Of Significant Accounting Policies [Line Items]
Useful life of property and equipment	27 years 6 months

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