|
Activity Associated with Warrants (Detail)
|
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2012
|
Dec. 31, 2013
|
|
| Class of Warrant or Right [Line Items] | ||
| Beginning Balance | 42,676,000 | 33,040,682 |
| Retirement of public warrants | (9,635,000) | |
| Ending Balance | 33,041,000 | 33,040,682 |