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Stock-based compensation (Details) (USD $)	9 Months Ended
	Sep. 30, 2012
Outstanding-Options	378,394
Granted-Options	15,813
Exercised-Options	(1,384)
Forfeited/expired-Options	(77,169)
Outstanding-Options	315,654
Exercisable-Options	199,300
Outstanding-Weighted Average Exercise Price	$ 14.91
Granted-Weighted Average Exercise Price	$ 7.13
Exercised-Weighted Average Exercise Price	$ 6.46
Forfeited/expired-Weighted Average Exercise Price	$ 18.99
Outstanding-Weighted Average Exercise Price	$ 13.56
Exercisable-Weighted Average Exercise Price	$ 15.34
Outstanding-Weighted Average Remaining Contractual Life (Years)	2 years 3 months 25 days
Exercisable-Weighted Average Remaining Contractual Life (Years)	1 year 5 months 26 days
Outstanding-Aggregate Intrinsic Value	$ 32,701	[1]
Exercisable-Aggregate Intrinsic Value	$ 32,701	[1]
[1] The intrinsic value of a stock option represents the amount by which the fair value of the underlying stock, measured by reference to the closing price of the common stock of $8.27 in the NASDAQ Global Select Market on September 30, 2012, exceeds the exercise price of the option.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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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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