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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Mar. 31, 2015
Income Tax Disclosure [Abstract]    
Net operating loss carryforwards $ 281,098 $ 272,498
Research and development and other tax credit carryforwards 11,878 10,655
Accruals and reserves 28,088 37,153
Fixed assets and intangible assets 2,393 2,432
Other 14,494 18,514
Gross deferred tax assets 337,951 341,252
Valuation allowance (301,393) (294,860)
Total deferred tax assets 36,558 46,392
Intercompany debt (27,117) (36,298)
Other (9,408) (10,174)
Total deferred tax liabilities (36,525) (46,472)
Net deferred tax asset $ 33  
Net deferred tax liability   $ (80)