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Income Taxes (Deferred Income Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Deferred tax assets:    
Net operating loss carryforwards $ 15,476 $ 4,306
Tax credit carryforwards 45,421 5,825
Accruals 42,765 41,570
Depreciation and amortization 1,505 2,860
Share-based compensation 7,479 11,846
Gross deferred tax assets 112,646 66,407
Valuation allowance (25,148) (6,626)
Gross deferred tax assets after valuation allowance 87,498 59,781
Deferred tax liabilities:    
Acquired intangible assets and other (4,827) (4,267)
Gross deferred tax liabilities (4,827) (4,267)
Deferred tax assets, net $ 82,671 $ 55,514