Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred Tax Assets
Accruals and reserves not currently deductible	$ 6,129	$ 6,631
Federal NOL and interest expense limitation carryovers	5,803	13,796
State NOL and interest expense limitation carryovers	476	1,106
Accrued and deferred compensation	1,966	2,888
Prepaid items	745	1,198
Lease liability	1,362	4,052
Contract liability	1,982	2,543
Other	657	1,010
Subtotal before valuation allowance	19,120	33,224
Less: valuation allowance	(6,330)	(6,330)
Total Deferred Tax Assets	19,120	26,894
Deferred Tax Liabilities
Property and equipment	(23,268)	(24,696)
Right-of-use asset	(2,046)	(4,791)
Other	(6)	(6)
Total Deferred Tax Liabilities	(25,320)	(29,493)
Net Deferred Income Tax Liabilities	$ (6,200)	$ (2,599)