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Significant Components of Deferred Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Deferred tax assets: |  |
Net operating loss carryforwards | $ 142,500 | $ 137,700
Research and development credit carryforwards | 32,100 | 30,800
Capitalized inventory costs | 800 | 900
Inventory reserve | 100 | 700
Capitalized research and development | 12,300 | 9,100
Capitalized intangible asset | 100 | 100
Deferred compensation | 4,900 | 4,800
Accrued liabilities | 200 | 100
Depreciation | 1,300 | 1,300
Acquisition costs | 200 | 200
Deferred tenant allowance | 100 | 200
Capital loss carryforwards | 3,900 | 3,900
Total deferred tax assets | 199,000 | 190,500
Valuation allowance | (199,000) | (190,500)
Net deferred tax assets |  |
Deferred tax liabilities: |  |
Amortization of goodwill | 89 | 62
Total deferred tax liabilities | 89 | 62
Trademarks |  |
Deferred tax assets: |  |
Capitalized intangible asset | 400 | 400
Capitalized Revenue Sharing Rights |  |
Deferred tax assets: |  |
Capitalized intangible asset | $ 100 | $ 300

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