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Fair Value Measurements (Tables)
 6 Months Ended
Jan. 31, 2018
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) 
January 31, 2018            
Available-for-sale securities:            
Marketable securities $10,862  $35,340  $—  $46,202 
Rafael Pharma Series D Note  —   —   6,300   6,300 
Total $10,862  $35,340  $6,300  $52,502 
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
January 31,

  

Six Months Ended
January 31,

 
  

2018

  

2017

  

2018

  

2017

 
  (in thousands) 
Balance, beginning of period $6,300  $4,200  $6,300  $2,000 
Purchases  —   —   —   2,200 
Balance, end of period $6,300  $4,200  $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 $—  $—  $—  $—