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Stockholders' Equity (Detail) - Status Summary Nonvested Stock Options (USD $)
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12 Months Ended | 0 Months Ended | 12 Months Ended | ||||||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Sep. 30, 2012
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Dec. 31, 2008
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Dec. 31, 2008
Nonvested [Member]
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Dec. 31, 2011
Nonvested [Member]
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Dec. 31, 2010
Nonvested [Member]
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Dec. 31, 2009
Nonvested [Member]
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| Nonvested Shares | 3,679,977 | 3,762,477 | 669,777 | 6,132,127 | 599,875 | 167,792 | 2,178,318 | 3,328,731 | 186,413 |
| Nonvested Stock Options Weighted-Average Grant Date Fair Value (in Dollars per share) | $ 1.67 | $ 0.87 | $ 0.88 | $ 2.41 | |||||
| Granted Shares | 3,246,450 | 93,402 | |||||||
| Granted Stock Options Weighted-Average Grant Date Fair Value (in Dollars per share) | $ 0.83 | $ 2.83 | $ 0.83 | $ 2.83 | |||||
| Forfeited Shares | (82,500) | (153,750) | (20,167) | (51,833) | (41,667) | (7,250) | |||
| Forfeited Stock Options Weighted-Average Grant Date Fair Value (in Dollars per share) | $ 0.88 | $ 1.92 | $ 2.84 | ||||||
| Vested Shares | (1,098,580) | (62,465) | (67,531) | ||||||
| Vested Stock Options Weighted-Average Grant Date Fair Value (in Dollars per share) | $ 0.89 | $ 2.31 | $ 1.11 | ||||||
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- Definition
Forfeited Stock Options Weighted-Average Grant Date Fair Value No definition available.
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- Definition
Nonvested Stock Options Weighted-Average Grant Date Fair Value No definition available.
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- Definition
Vested Stock Options Weighted Average Grant Date Fair Value No definition available.
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- Definition
The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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