Stock-Based Compensation (Detail 1) - $ / shares	3 Months Ended	12 Months Ended
Mar. 31, 2016	Dec. 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding Options, Shares	245,593	369,887
Outstanding Options, Weighted- Average Remaining Contractual Term	8 years 4 months 20 days	9 years 1 month 6 days
Weighted Average- Exercise Price	$ 5.36	$ 4.64
Exercisable Options, Shares	75,385	51,555
Exercisable Options, Weighted- Average Exercise Price	$ 10.47	$ 14.12
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	$ 3.10	$ 3.10
Outstanding Options, Shares	216,849	339,946
Outstanding Options, Weighted- Average Remaining Contractual Term	9 years 4 months 10 days	9 years 9 months 18 days
Weighted Average- Exercise Price	$ 3.10	$ 3.10
Exercisable Options, Shares	46,641	21,614
Exercisable Options, Weighted- Average Exercise Price	$ 3.10	$ 3.10
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	$ 5.60	$ 5.60
Outstanding Options, Shares	2,500	2,500
Outstanding Options, Weighted- Average Remaining Contractual Term	1 year 29 days	1 year 3 months 29 days
Weighted Average- Exercise Price	$ 5.60	$ 5.60
Exercisable Options, Shares	2,500	2,500
Exercisable Options, Weighted- Average Exercise Price	$ 5.60	$ 5.60
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	$ 11.40	$ 6.90
Outstanding Options, Shares	17,674	625
Outstanding Options, Weighted- Average Remaining Contractual Term	1 year 29 days	4 days
Weighted Average- Exercise Price	$ 11.40	$ 6.90
Exercisable Options, Shares	17,674	625
Exercisable Options, Weighted- Average Exercise Price	$ 11.40	$ 6.90
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	$ 30.40	$ 11.40
Outstanding Options, Shares	7,070	17,804
Outstanding Options, Weighted- Average Remaining Contractual Term	1 year 29 days	1 year 3 months 25 days
Weighted Average- Exercise Price	$ 30.40	$ 11.40
Exercisable Options, Shares	7,070	17,804
Exercisable Options, Weighted- Average Exercise Price	$ 30.40	$ 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	$ 143.00	$ 22.70
Outstanding Options, Shares	1,500	442
Outstanding Options, Weighted- Average Remaining Contractual Term	2 months 16 days	4 days
Weighted Average- Exercise Price	$ 143.00	$ 22.70
Exercisable Options, Shares	1,500	442
Exercisable Options, Weighted- Average Exercise Price	$ 143.00	$ 22.70
Range Of Exercise Prices - Range 6 [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 Term		1 year 3 months 29 days
Weighted Average- Exercise Price		$ 30.40
Exercisable Options, Shares		7,070
Exercisable Options, Weighted- Average Exercise Price		$ 30.40
Range Of Exercise Prices - Range 7 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Per Share		$ 143.00
Outstanding Options, Shares		1,500
Outstanding Options, Weighted- Average Remaining Contractual Term		5 months 12 days
Weighted Average- Exercise Price		$ 143.00
Exercisable Options, Shares		1,500
Exercisable Options, Weighted- Average Exercise Price		$ 143.00

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

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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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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
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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