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INCOME TAXES - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Assets:    
Net operating loss carryforwards $ 76,278 $ 58,624
Research and development tax credits 28,664 24,499
Deferred revenue 5,755 5,886
Accrued expenses 9,601 10,786
Inventory 4,906 5,980
Stock-based compensation 1,536 727
Fixed assets 7,716 7,452
Other temporary differences 1,943 1,556
Deferred tax assets, gross 136,399 115,510
Valuation allowance (101,484) (89,600)
Total deferred tax assets 34,915 25,910
Liabilities:    
Purchased intangible assets (26,014) (17,092)
Unremitted foreign income (4,487) (3,171)
Total deferred tax liabilities (30,501) (20,263)
Total net deferred tax assets 4,414 5,647
Deferred income taxes - noncurrent assets 9,152 8,434
Deferred income taxes - noncurrent liabilities $ (4,738) $ (2,787)