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Fair Value Of Financial Instruments (Tables)
9 Months Ended
Jan. 31, 2014
Fair Value Of Financial Instruments [Abstract]  
Summary Of Activity Of Level 3 Inputs Measured On A Recurring Basis

 

 

 

 

 

(in thousands)

 

Common stock warrants

Balance at April 30, 2013

 

$

 

204 

Change in fair value of common stock warrant liability

 

 

 

51 

Balance at January 31, 2014

 

 

 

255