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Stockholders' Equity - Warrants to Purchase Common Shares - Additional Information (Detail) - $ / shares				6 Months Ended	12 Months Ended
	Jun. 26, 2018	Mar. 28, 2018	Aug. 07, 2017	Dec. 31, 2018	Jun. 30, 2018	Jun. 30, 2017
Class of Stock [Line Items]
Warrants issued in connection with term loan facility				0	486,812	0
Exercise price of issued warrants				$ 0	$ 1.23	$ 0
Warrants [Member] | Investor [Member]
Class of Stock [Line Items]
Expiration date of five-year Investor warrants			5 years
Senior Secured Term Loan [Member] | Warrants [Member]
Class of Stock [Line Items]
Warrants issued in connection with term loan facility	77,721	409,091
Exercise price of issued warrants	$ 1.93	$ 1.10
Warrants exercise period	7 years	7 years

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- Definition

Exercise price of issued warrants.

+ References

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- Definition

The expiration of five year investor warrants.

+ References

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- Definition

Warrants exercise period.

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No definition available.

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- Definition

Warrants issued in connection with term loan facility.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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