Earnings Per Common Share - Schedule of Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Numerator:
Numerator: Net loss	$ (6,355)	$ (32,167)
Denominator:
Weighted average shares—basic (in shares)	15,550,000	11,696,000
Common stock equivalents (in shares)	0	0
Weighted average shares—diluted (in shares)	15,550,000	11,696,000
Earnings per common share:
Net loss per basic common share (usd per share)	$ (0.41)	$ (2.75)
Net loss per diluted common share (usd per share)	$ (0.41)	$ (2.75)
Antidilutive stock-based awards excluded (in shares)	463,000	985,000