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Share-based Compensation Plans and Awards - Warrants (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified |
1 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
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Jan. 31, 2011
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Jan. 31, 2011
LAF Warrant [Member]
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Jan. 31, 2008
LAF Warrant [Member]
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Sep. 30, 2012
BEI Warrant [Member]
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| Class of Warrant or Right [Line Items] | ||||
| Fully-vested warrant exercisable period | 4 years | |||
| Warrants to purchase common stock (in shares) | 312 | 375 | ||
| Warrants exercise price (usd per share) | $ 12.00 | $ 12.00 | ||
| Warrants exercised into common stock (in shares) | 477 | 184 | ||