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

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

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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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No definition available.

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- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Stock-Based Compensation (Detail 1) - $ / shares	12 Months Ended
Stock-Based Compensation (Detail 1) - $ / shares	Dec. 31, 2016	Jan. 21, 2016	Jan. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Per Share		$ 1.79	$ 30.40
Outstanding Options, Shares	514,772
Outstanding Options, Weighted- Average Remaining Contractual Life (Years)	8 years 9 months 18 days
Weighted Average- Exercise Price	$ 2.77
Exercisable Options, Shares	181,337
Exercisable Options, Weighted- Average Exercise Price Per Share	$ 4.73
Range of Exercise Prices - Range 1 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Per Share	$ 1.41
Outstanding Options, Shares	305,000
Outstanding Options, Weighted- Average Remaining Contractual Life (Years)	9 years 6 months 18 days
Weighted Average- Exercise Price	$ 1.41
Exercisable Options, Shares	30,210
Exercisable Options, Weighted- Average Exercise Price Per Share	$ 1.41
Range of Exercise Prices - Range 2 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Per Share	$ 3.10
Outstanding Options, Shares	182,528
Outstanding Options, Weighted- Average Remaining Contractual Life (Years)	8 years 9 months 14 days
Weighted Average- Exercise Price	$ 3.10
Exercisable Options, Shares	123,883
Exercisable Options, Weighted- Average Exercise Price Per Share	$ 3.10
Range of Exercise Prices - Range 3 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Per Share	$ 5.60
Outstanding Options, Shares	2,500
Outstanding Options, Weighted- Average Remaining Contractual Life (Years)	3 months 29 days
Weighted Average- Exercise Price	$ 5.60
Exercisable Options, Shares	2,500
Exercisable Options, Weighted- Average Exercise Price Per Share	$ 5.60
Range of Exercise Prices - Range 4 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Per Share	$ 11.40
Outstanding Options, Shares	17,674
Outstanding Options, Weighted- Average Remaining Contractual Life (Years)	3 months 29 days
Weighted Average- Exercise Price	$ 11.40
Exercisable Options, Shares	17,674
Exercisable Options, Weighted- Average Exercise Price Per Share	$ 11.40
Range of Exercise Prices - Range 5 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Per Share	$ 30.40
Outstanding Options, Shares	7,070
Outstanding Options, Weighted- Average Remaining Contractual Life (Years)	3 months 29 days
Weighted Average- Exercise Price	$ 30.40
Exercisable Options, Shares	7,070
Exercisable Options, Weighted- Average Exercise Price Per Share	$ 30.40