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Temporary Differences in Financial Statement Carrying Amounts and Tax Bases of Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax asset |  |
Inventories | $ 3,213 | $ 5,359
State income taxes | 330 | 213
Program accrual | 7,381 | 12,318
Vacation pay accrual | 600 | 818
Accrued bonuses | 1,073 | 2,072
Bad debt expense | 12 | 6
Stock compensation | 822 | 1,614
Tax credit | 778 | 14
Other | 381 | 2,707
Deferred tax asset | 14,644 | 25,472
Deferred tax liability |  |
NOL carryforward | 54 | 351
Plant and equipment, principally due to differences in depreciation and capitalized interest | 29,986 | 30,636
Prepaid expenses | 942 | 1,542
Deferred tax liability | 30,928 | 32,178
Total net deferred tax liability | $ 16,284 | $ 6,706

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