Income Taxes - Current and Non-current Deferred Income Tax Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred income tax assets (liabilities):
Allowance for doubtful accounts	$ 340	$ 15,201
Accrued vacation	759	962
Other accruals	84	476
Other	66	29
Net operating loss carry-forwards	12,222	502
AMT credit carry-forward	144	152
Nonqualified stock options and warrants	1,264	1,377
Accumulated depreciation and amortization	(29,852)	(34,440)
Net deferred income tax liabilities	$ (14,973)	$ (15,741)