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Income Taxes - Significant Components of Deferred Tax Assets (Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets (liabilities):    
Deferred revenues $ 5,910 $ 4,129
Share-based compensation 8,094 6,483
Inventory-related items 4,953 3,507
Tax credit carryforwards 12,105 13,472
Reserves and accruals 8,160 5,712
Loss carryforwards 8,461 9,484
Lease liability 15,465 15,471
Other, net 1,578 543
Gross deferred tax assets 64,726 58,801
Valuation allowance (1,199) (1,186)
Total net deferred tax assets 63,527 57,615
Intangibles (22,010) (18,941)
Depreciation and amortization (36,528) (35,941)
Prepaid expenses (15,654) (13,395)
Right-of-use assets (13,949) (14,286)
Total deferred tax liabilities (88,141) (82,563)
Net deferred tax liabilities $ (24,614) $ (24,948)