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Stockholders' Equity - Common Stock Warrants (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Class of Warrant or Right [Line Items]
Number Of Warrants Exercised	0	23,275	11,908
Warrants Exercised Weighted Average Exercise Price		$ 0.33	$ 0.33
Number of warrants expired	0	1,544	0
Warrants expiring July 18, 2018 | Common Stock
Class of Warrant or Right [Line Items]
Number of shares underlying outstanding warrants	236,632
Exercise price per share	$ 0.33
Warrants expiring January 16, 2019 | Common Stock
Class of Warrant or Right [Line Items]
Number of shares underlying outstanding warrants	301,986
Exercise price per share	$ 0.33
Warrants expiring January 30, 2019 | Common Stock
Class of Warrant or Right [Line Items]
Number of shares underlying outstanding warrants	15,250
Exercise price per share	$ 0.33

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- Definition

The number of warrants that expired during the period.

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ 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)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- 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

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