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1. Organization and Summary of Significant Accounting Policies (Tables)
3 Months Ended
Jun. 30, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Potentially dilutive securities effect on net loss per share
    June 30,  
    2013     2012  
    (in thousands)  
Options to purchase common stock     921       886  
Warrants to purchase common stock     1,318       1,529  
      2,239       2,415