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Income Taxes (Deferred Income Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Deferred tax assets:    
Net operating loss carryforwards $ 16,323 $ 15,476
Tax credit carryforwards 52,263 45,421
Accruals 52,304 42,765
Depreciation and amortization 5,716 1,505
Share-based compensation 8,703 7,479
Gross deferred tax assets 135,309 112,646
Valuation allowance (28,375) (25,148)
Gross deferred tax assets after valuation allowance 106,934 87,498
Deferred tax liabilities:    
Acquired intangible assets and other (18,176) (4,827)
Gross deferred tax liabilities (18,176) (4,827)
Deferred tax assets, net $ 88,758 $ 82,671