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Warrants - Additional Information (Detail) - USD ($)		9 Months Ended		12 Months Ended
	Dec. 02, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Class Of Warrant Or Right [Line Items]
Warrants to purchase common stock		3,999,998		3,999,998
Purchase price per share		$ 0.0045		$ 0.0045
Warrants expiration duration		8 years		8 years
Expense recognized for warrants performance criteria.		$ 70,000	$ 0	$ 0	$ 0
Subsequent Event
Class Of Warrant Or Right [Line Items]
Accelerated recognition of remaining warrant expense	$ 279,000

X

- Definition

Accelerated recognition of remaining warrant expense.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Expense recognized for warrants performance criteria.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Warrants expiration duration.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
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X

- 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.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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X

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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- Definition

Per share or per unit amount of equity securities issued.

+ References

No definition available.

+ Details

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- Details

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