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Summary of Stock Option Activity (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013
Number of shares outstanding
Outstanding at December 31, 2012	192,729
Granted	0
Exercised	0
Expired or Forfeited	0
Outstanding at March 31, 2013	192,729
Weighted Average Exercise Price
Outstanding at December 31, 2012	$ 10.68
Granted	$ 0
Exercised	$ 0
Expired or Forfeited	$ 0
Outstanding at March 31, 2013	$ 10.68
Options Outstanding, Price per Share Range
Beginning Balance, lower limit	$ 1.70
Beginning Balance, upper limit	$ 17.50
Granted, lower limit	$ 0
Granted, upper limit	$ 0
Exercised, lower limit	$ 0
Exercised, upper limit	$ 0
Expired or Forfeited, lower limit	$ 0
Expired or Forfeited, upper limit	$ 0
Ending Balance, lower limit	$ 1.70
Ending Balance, upper limit	$ 17.50

X

- Definition

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.

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Net number of share options (or share units) granted during the period.

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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.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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