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Difference between Consolidated Income Tax Benefit and Amount Computed by Federal Statutory Income Tax Rate (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income tax benefit at federal statutory rate	$ (36,301,000)	$ (30,818,000)	$ (22,678,000)
State tax	(394,000)	1,204,000	(178,000)
Business credits	(2,622,000)	(1,484,000)	(2,515,000)
Deferred compensation charges	1,481,000	2,710,000	3,072,000
Change in valuation allowance	36,766,000	28,093,000	22,354,000
Other	1,070,000	295,000	(55,000)
Total income tax expense	$ 0	$ 0	$ 0

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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