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Stock-Based Compensation Plans - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Aug. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of stock options granted	144,000	358,287
Weighted average exercise price of stock options granted	$ 7.05	$ 10.10
Number of stock options exercised	0	0
Number of stock options forfeited	147,749	0
Stock options outstanding	354,538	358,287
Weighted average exercise price of outstanding options	$ 8.86	$ 10.10
Weighted average remaining life of outstanding stock options	8 years 7 months 6 days	9 years 3 months 18 days
Aggregate intrinsic value of outstanding stock options	$ 203,000	$ 0
Number of stock options exercisable	42,108
Weighted average exercise price of stock options exercisable	$ 10.10
Weighted average remaining life of exercisable stock options	8 years 2 months 12 days
Aggregate intrinsic value of exercisable stock options	$ 0
Number of restricted stock forfeited	56,533
Stock-based compensation expense	$ 298,000	$ 278,000
Reversal of stock compensation expense	152,000
Unrecognized compensation cost related to equity award grants	$ 1,600,000
Unrecognized compensation cost expected remaining vesting period	4 years
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted	71,308	132,974
Weighted average grant date fair value	$ 7.05	$ 10.10
Number of restricted stock forfeited	56,533	0
Number of shares vested	15,289	0
Number of shares withheld for tax withholding purposes	1,826
Number of shares outstanding	132,460
Weighted average grant date fair value of shares outstanding	$ 8.63
2018 Equity Incentive Plan | Restricted Stock | Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares approved under the plan			147,749
2018 Equity Incentive Plan | Stock Options | Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares approved under the plan			369,374

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