Summary of Significant Accounting Policies - Schedule of Basic and Diluted Weighted Average Common Shares (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	18,827	18,492	18,091
Weighted average common equivalent shares	108		289
Diluted weighted average common shares outstanding	18,935	18,492	18,380
Options and restricted stock units excluded from diluted weighted average share calculation as effect would have been anti-dilutive	326	1,099	8