|
Warrants - Summary of Warrants Outstanding (Detail)
|
Sep. 30, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
|---|---|---|---|
| Class of Warrant or Right [Line Items] | |||
| Warrants Outstanding | 2,747,094 | 3,235,982 | 306,388 |
|
Range 1 [Member]
|
|||
| Class of Warrant or Right [Line Items] | |||
| Exercise Price | 1.50 | ||
| Warrants Outstanding | 571,169 | ||
| Expiration Dates | Jul. 30, 2017 | ||
|
Range 2 [Member]
|
|||
| Class of Warrant or Right [Line Items] | |||
| Exercise Price | 2.00 | ||
| Warrants Outstanding | 2,170,925 | ||
| Expiration Dates | Mar. 23, 2015 | ||
|
Range 3 [Member]
|
|||
| Class of Warrant or Right [Line Items] | |||
| Exercise Price | 10.00 | ||
| Warrants Outstanding | 5,000 | ||
| Expiration Dates | Apr. 15, 2014 |