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Fair Value Measurements (Tables)
 3 Months Ended
Oct. 31, 2017
Fair Value Measurements [Abstract]  
Summary of balance of assets measured at fair value on a recurring basis
  Level 1 (1)  Level 2 (2)  Level 3 (3)  Total 
  (in thousands) 
October 31, 2017            
Available-for-sale securities:            
Marketable securities $10,891  $43,400  $—  $54,291 
Rafael Pharma Series D Note  —   —   6,300   6,300 
Total $10,891  $43,400  $6,300  $60,591 
July 31, 2017                
Available-for-sale securities:                
Marketable securities $12,151  $46,121  $—  $58,272 
Rafael Pharma Series D Note  —   —   6,300   6,300 
Total $12,151  $46,121  $6,300  $64,572 

 

(1) – quoted prices in active markets for identical assets or liabilities

(2) – observable inputs other than quoted prices in active markets for identical assets and liabilities

(3) – no observable pricing inputs in the market
Summary of assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
  Three Months Ended
October 31,		 
  2017  2016 
  (in thousands) 
Balance, beginning of period $6,300  $2,000 
Purchases  —   2,200 
Balance, end of period $6,300  $4,200 
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the period $—  $—