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Temporary Differences in Financial Statement Carrying Amounts and Tax Bases of Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax asset |  |
Inventories | $ 1,777 | $ 1,416
Program accrual | 9,098 | 7,306
Vacation pay accrual | 792 | 815
Accrued bonuses | 1,250 | 589
Bad debt expense | 1,361 | 952
Stock compensation | 1,532 | 2,079
Domestic NOL carryforward | 675 | 708
Foreign NOL carryforward | 1,718 | 1,434
Tax credits | 807 | 931
Lease liability | 6,718 | 3,378
Accrued expenses | 723 | 347
Unrealized foreign exchange loss | 3,847 | 2,798
Other | 744 | 735
Deferred tax asset | 31,042 | 23,488
Less valuation allowance | (4,262) | 0
Deferred tax asset, net | 26,780 | 23,488
Deferred tax liability |  |
Plant and equipment, principally due to differences in depreciation and capitalized interest | 37,113 | 36,878
Lease assets | 6,600 | 3,332
Prepaid expenses | 1,666 | 1,508
Deferred revenue | 1,014 | 874
Other | 123 | 1,692
Deferred tax liability | 46,516 | 44,284
Total net deferred tax liability | $ 19,736 | $ 20,796

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