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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

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