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v2.4.0.8
Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended 0 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Jan. 29, 2014
Underwritten Public Offering
Feb. 21, 2014
Underwriters Exercised in full Over-allotment Option
Organization And Summary Of Significant Accounting Policies [Line Items]        
Annual payment for inventory of gabapentin enacarbil in GSK's possession for six years beginning in 2016 $ 1,000,000 $ 1,000,000    
Common stock issued in underwritten public offering     12,000,000 1,800,000
Common stock price     $ 6.00  
Net cash proceeds from shares offering     $ 67,300,000 $ 10,100,000