Stock-Based Compensation - Summary of Unvested Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Options
Unvested, beginning balance (in shares)	59,139
Granted (in shares)	24,208	23,218	14,755
Vested (in shares)	23,112
Forfeited (in shares)	991
Unvested, ending balance (in shares)	59,244	59,139
Weighted Average Grant Date Fair Value
Unvested, beginning balance (in usd per share)	$ 9.64
Granted (in usd per share)	8.41
Vested (in usd per share)	9.33
Forfeited (in usd per share)	9.29
Unvested, ending balance (in usd per share)	$ 9.27	$ 9.64