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INCOME TAXES - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Assets:    
Net operating loss carryforwards $ 61,057 $ 76,278
Research and development tax credits 32,879 28,664
Deferred revenue 7,868 5,755
Accrued expenses 5,687 9,601
Inventory 4,618 4,906
Stock-based compensation 2,880 1,536
Fixed assets 5,461 7,716
Other temporary differences 2,138 1,943
Deferred tax assets, gross 122,588 136,399
Valuation allowance (94,980) (101,484)
Total deferred tax assets 27,608 34,915
Liabilities:    
Purchased intangible assets (22,470) (26,014)
Unremitted foreign income (4,827) (4,487)
Total deferred tax liabilities (27,297) (30,501)
Total net deferred tax assets 311 4,414
Deferred income taxes - noncurrent assets 4,959 9,152
Deferred income taxes - noncurrent liabilities $ (4,648) $ (4,738)