Loss Per Common Share - Reconciliation of Basic Loss Per Common Share to Diluted Loss Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Net loss—basic and diluted:
Loss from continuing operations									$ (11,790)	$ (3,439)
Loss from discontinued operations									(2,534)	(27,030)
NET LOSS	$ 3,077	$ (3,995)	$ (8,604)	$ (4,802)	$ (12,788)	$ (8,108)	$ (5,307)	$ (4,266)	$ (14,324)	$ (30,469)
Weighted average common shares outstanding:
Weighted average common shares outstanding—basic (in shares)									23,885	23,259
Dilutive effect of common stock equivalents (in shares)									0	0
Weighted average common shares outstanding—diluted (in shares)									23,885	23,259
Net loss per common share—basic and diluted:
Loss from continuing operations (in dollars per share)									$ (0.49)	$ (0.15)
Loss from discontinued operations (in dollars per share)									(0.11)	(1.16)
Net loss per common share, basic and diluted (in dollars per share)	$ 0.13	$ (0.17)	$ (0.36)	$ (0.20)	$ (0.54)	$ (0.35)	$ (0.23)	$ (0.19)	$ (0.60)	$ (1.31)