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Term Loan Agreement - Additional Information (Detail)
Feb. 13, 2019
USD ($)
Jun. 26, 2018
USD ($)
$ / shares
shares
Mar. 28, 2018
USD ($)
Tranches
$ / shares
shares
Feb. 28, 2019
USD ($)
Dec. 31, 2018
$ / shares
Jun. 30, 2018
$ / shares
Jun. 30, 2017
$ / shares
Jun. 30, 2016
$ / shares
Term Loan Agreement [Line Items]                
Senior secured term loan, initial advance       $ 35,000,000        
Weighted average exercise price of issued warrants | $ / shares         $ 1.23 $ 1.23 $ 2.50 $ 2.50
Senior Secured Term Loan [Member]                
Term Loan Agreement [Line Items]                
Upfront loan origination fee percentage     1.50%          
Debt issue costs     $ 1,800,000          
Cost allocated tranches, number | Tranches     2          
Aggregate Fairvalue of warrants     $ 353,000          
Senior Secured Term Loan [Member] | Initial Advance [Member]                
Term Loan Agreement [Line Items]                
Debt discount     2,100,000          
Proceeds from issuance of term loan, net of allocation to the debt warrant     14,600,000          
Senior Secured Term Loan [Member] | Additional Advance [Member]                
Term Loan Agreement [Line Items]                
Debt issue costs     $ 299,000          
Debt discount   $ 652,000            
Amortization of deferred debt issue cost through the date of the Additional Advance   97,000            
Debt issuance costs remaining balance reclassified to debt discount   $ 202,000            
Senior Secured Term Loan [Member] | Warrants [Member]                
Term Loan Agreement [Line Items]                
Warrants exercise period   7 years 7 years          
Senior Secured Term Loan [Member] | Warrants [Member] | Initial Advance [Member]                
Term Loan Agreement [Line Items]                
Warrants issued in connection with loan | shares     409,091          
Weighted average exercise price of issued warrants | $ / shares     $ 1.10          
Fair Value Of Warrants Issued     $ 284,000          
Senior Secured Term Loan [Member] | Warrants [Member] | Additional Advance [Member]                
Term Loan Agreement [Line Items]                
Warrants issued in connection with loan | shares   77,721            
Weighted average exercise price of issued warrants | $ / shares   $ 1.93            
Warrants, contingent issuance fair value     $ 69,000          
Revaluation of additional advance warrants shares reclassified to equity   $ 87,000            
Senior Secured Term Loan [Member] | SWK Funding LLC [Member]                
Term Loan Agreement [Line Items]                
Agreement date     Mar. 28, 2018          
Senior secured term loan     $ 20,000,000          
Senior secured term loan, initial advance     $ 15,000,000          
Maturity date     Mar. 27, 2023          
Exit fee percentage payable upon repayment of the total secured term loan     6.00%          
Senior secured term loan, additional advance that followed satisfaction of applicable conditions   $ 5,000,000            
Senior Secured Term Loan [Member] | SWK Funding LLC [Member] | London Interbank Offered Rate (LIBOR) [Member]                
Term Loan Agreement [Line Items]                
Interest rate     Three-month LIBOR rate (subject to a 1.5% floor) plus 10.50%.          
LIBOR rate floor     1.50%          
interest rate percentage above LIBOR rate     10.50%          
Senior Secured Term Loan [Member] | SWK Funding LLC [Member] | Loan Refinancing [Member]                
Term Loan Agreement [Line Items]                
Payment of contractual 6% exit fee upon repayment of secured term loan $ 1,200,000              
Accrued and unpaid interest through the date of the secured term loan refinancing 664,000              
Payment of additional make-whole interest 306,000              
Prepayment penalty for voluntary repayment of the secured term loan $ 1,200,000