Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accounting Policies [Line Items]
Accumulated deficit	$ 326,000,000
Cash used in operating activities	(4,001,000)	(846,000)
Restatement Adjustment
Accounting Policies [Line Items]
Cash used in operating activities		400,000
Cash used in financing activities		$ (400,000)