Income Taxes - Summary of Deferred Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Net operating losses	$ 85,510	$ 82,753
Credit carryovers	19,903	19,903
Depreciation and amortization	14,922	12,915
Accruals and reserves	808	322
Capital loss carryover	100	100
Other	3,660us-gaap_DeferredTaxAssetsOther	3,808us-gaap_DeferredTaxAssetsOther
Total deferred tax assets	124,903us-gaap_DeferredTaxAssetsGross	119,801us-gaap_DeferredTaxAssetsGross
Less valuation allowance	(124,903)	(119,801)
Net deferred tax assets	$ 0us-gaap_DeferredTaxAssetsNet	$ 0us-gaap_DeferredTaxAssetsNet

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible capital loss carryforwards.

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