Earnings Per Common Share - Schedule of Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Numerator: Net loss	$ (7,125)	$ (6,779)	$ (23,044)	$ (6,052)	$ (5,006)	$ (6,355)	$ (36,948)	$ (17,413)
Denominator:
Weighted average shares—basic (in shares)	15,771,000			15,715,000			15,762,000	15,657,000
Common stock equivalents (in shares)	0			0			0	0
Weighted average shares—diluted (in shares)	15,771,000			15,715,000			15,762,000	15,657,000
Loss per common share:
Net loss per basic common share (usd per share)	$ (0.45)			$ (0.39)			$ (2.34)	$ (1.11)
Net loss per diluted common share (usd per share)	$ (0.45)			$ (0.39)			$ (2.34)	$ (1.11)
Antidilutive stock-based awards excluded (in shares)	422,000			580,000			409,000	516,000