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Notes Payable (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jul. 31, 2015
May. 31, 2015
Mar. 31, 2015
Aug. 27, 2014
Jun. 30, 2015
Line of Credit Facility          
Proceeds from Issuance of Promissory notes         $ 5,000
Net proceeds from IPO         $ 62,763
Debt Instruments          
Number of shares after conversion of warrants         24,566
Exercise price of warrants (in dollars per share)         $ 12.14
Term Loan B          
Line of Credit Facility          
Proceeds from Issuance of Promissory notes     $ 5,000    
Term Loan A          
Line of Credit Facility          
Initial borrowings     5,000    
Proceeds from Issuance of Promissory notes       $ 5,000  
Other Term Loan          
Line of Credit Facility          
Initial borrowings     20,000    
Credit Facility          
Line of Credit Facility          
Maximum borrowing capacity     $ 25,000    
Amount available for borrowing $ 10,000 $ 5,000      
Number of monthly payments (in number of payments)         36
Interest rate (as a percent)         7.49%
Percentage of amount outstanding due as a payment (as a percent)         3.48%
Effective interest rate (as a percent)         11.20%
Debt Instruments          
Financial covenants         0
Final judgment amount that would trigger lender rights for remedy         $ 250,000
Interest rate increase in the event of a default (as a percent)         5.00%
Minimum | Credit Facility          
Line of Credit Facility          
Net cash proceeds from equity financing   $ 8,000      
Net proceeds from IPO $ 50,000        
Percentage of amount outstanding due as a payment (as a percent)         1.00%
Maximum | Credit Facility          
Line of Credit Facility          
Percentage of amount outstanding due as a payment (as a percent)         3.00%
Warrants          
Debt Instruments          
Exercise period         7 years
Warrants | Credit Facility          
Line of Credit Facility          
Percentage of outstanding Common Stock available for issuance (as a percent) 3.00% 3.00%      
2014 Warrants          
Debt Instruments          
Value of warrants         $ 100
Debt discount         $ 100
2014 Warrants | Term Loan A          
Debt Instruments          
Number of shares after conversion of warrants         157,844
Exercise price of warrants (in dollars per share)         $ 0.9503
2015 Warrants          
Debt Instruments          
Value of warrants         $ 100
Debt discount         $ 100
2015 Warrants | Term Loan B          
Debt Instruments          
Number of shares after conversion of warrants         157,844
Exercise price of warrants (in dollars per share)         $ 0.9503