XML 51 R37.htm IDEA: XBRL DOCUMENT v3.3.1.900
Marketable Securities and Fair Value Measurements - Fair Value of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Jan. 31, 2016
Dec. 31, 2015
Jan. 31, 2015
Jan. 31, 2014
Marketable securities:        
Marketable securities $ 7,379   $ 0 $ 0
Corporate Debt Securities        
Marketable securities:        
Marketable securities 5,559      
Asset-backed Securities        
Marketable securities:        
Marketable securities 1,820      
Fair Value Measurements Recurring        
Restricted cash:        
Total assets measured at fair value 35,331 $ 3,367    
Fair Value Measurements Recurring | Level 1        
Restricted cash:        
Total assets measured at fair value 984      
Fair Value Measurements Recurring | Level 2        
Restricted cash:        
Total assets measured at fair value 34,347 3,367    
Fair Value Measurements Recurring | Corporate Debt Securities        
Marketable securities:        
Marketable securities 5,559      
Fair Value Measurements Recurring | Corporate Debt Securities | Level 2        
Marketable securities:        
Marketable securities 5,559      
Fair Value Measurements Recurring | Asset-backed Securities        
Marketable securities:        
Marketable securities 1,820      
Fair Value Measurements Recurring | Asset-backed Securities | Level 2        
Marketable securities:        
Marketable securities 1,820      
Fair Value Measurements Recurring | Certificates Of Deposit        
Restricted cash:        
Restricted cash 26,968 3,367    
Fair Value Measurements Recurring | Certificates Of Deposit | Level 2        
Restricted cash:        
Restricted cash 26,968 $ 3,367    
Fair Value Measurements Recurring | Money Market Funds        
Restricted cash:        
Restricted cash 984      
Fair Value Measurements Recurring | Money Market Funds | Level 1        
Restricted cash:        
Restricted cash $ 984