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Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Net operating loss carryforwards $ 125,016 $ 117,028
Research and development credit carryforwards 26,705 25,061
Capitalized research and development 15,293 17,195
Compensation related items 8,310 7,011
Other 4,013 3,116
Total deferred tax assets 179,337 169,411
Valuation allowance (179,245) (169,332)
Net deferred tax assets 92 79
Deferred tax liabilities:    
Amortization of goodwill 127 111
Total deferred tax liabilities $ 127 $ 111