Stockholders' Equity - Summary of Information About Warrants (Detail) - Jun. 30, 2015 - $ / shares	Total
Class Of Warrant Or Right [Line Items]
Warrants outstanding	1,437,011
Warrant 1
Class Of Warrant Or Right [Line Items]
Exercise prices	$ 70.60
Warrants outstanding	94,897
Remaining Life in Years	1 year 10 months 24 days
Warrant 2
Class Of Warrant Or Right [Line Items]
Exercise prices	$ 5.00
Warrants outstanding	390,625
Remaining Life in Years	1 year
Warrant 3
Class Of Warrant Or Right [Line Items]
Exercise prices	$ 5.09
Warrants outstanding	239,534
Remaining Life in Years	1 year
Warrant 4
Class Of Warrant Or Right [Line Items]
Exercise prices	$ 1.38
Warrants outstanding	24,324
Remaining Life in Years	6 months
Warrant 5
Class Of Warrant Or Right [Line Items]
Exercise prices	$ 4.16
Warrants outstanding	1,000
Remaining Life in Years	1 year 6 months
Warrant 6
Class Of Warrant Or Right [Line Items]
Exercise prices	$ 3.25
Warrants outstanding	334,347
Remaining Life in Years	1 year 1 month 6 days
Warrant 7
Class Of Warrant Or Right [Line Items]
Exercise prices	$ 2.12
Warrants outstanding	75,000
Remaining Life in Years	2 years 6 months
Warrant 8
Class Of Warrant Or Right [Line Items]
Exercise prices	$ 1.83
Warrants outstanding	277,284
Remaining Life in Years	2 years 6 months