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2004 Plan outstanding and exercisable options by price range (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Options Outstanding, No of options	1,659,170	1,624,188	1,410,090
Options Outstanding, Wtd. avg. remaining life (in yrs.)	6 years 6 months 29 days
Options Outstanding, Wtd. avg. Exercise Price (US$ per share)	$ 2.29	$ 2.47	$ 2.70
Options Exercisable, No of options	1,357,711
Options Exercisable, Wtd. avg. Exercise Price (US$ per share)	$ 2.45
Price Range $1.03 - $1.20
Options Outstanding, No of options	335,922
Options Outstanding, Wtd. avg. remaining life (in yrs.)	9 years 0 months 29 days
Options Outstanding, Wtd. avg. Exercise Price (US$ per share)	$ 1.07
Options Exercisable, No of options	191,392
Options Exercisable, Wtd. avg. Exercise Price (US$ per share)	$ 1.09
Price Range $1.50 - $1.82
Options Outstanding, No of options	186,972
Options Outstanding, Wtd. avg. remaining life (in yrs.)	7 years 9 months 0 days
Options Outstanding, Wtd. avg. Exercise Price (US$ per share)	$ 1.74
Options Exercisable, No of options	117,562
Options Exercisable, Wtd. avg. Exercise Price (US$ per share)	$ 1.77
Price Range $1.95 - $2.36
Options Outstanding, No of options	411,917
Options Outstanding, Wtd. avg. remaining life (in yrs.)	4 years 0 months 29 days
Options Outstanding, Wtd. avg. Exercise Price (US$ per share)	$ 2.14
Options Exercisable, No of options	333,358
Options Exercisable, Wtd. avg. Exercise Price (US$ per share)	$ 2.11
Price Range $2.49 - $2.74
Options Outstanding, No of options	67,601
Options Outstanding, Wtd. avg. remaining life (in yrs.)	6 years 6 months 29 days
Options Outstanding, Wtd. avg. Exercise Price (US$ per share)	$ 2.73
Options Exercisable, No of options	58,641
Options Exercisable, Wtd. avg. Exercise Price (US$ per share)	$ 2.74
Price Range $3.04 - $3.45
Options Outstanding, No of options	653,268
Options Outstanding, Wtd. avg. remaining life (in yrs.)	6 years 6 months 29 days
Options Outstanding, Wtd. avg. Exercise Price (US$ per share)	$ 3.08
Options Exercisable, No of options	653,268
Options Exercisable, Wtd. avg. Exercise Price (US$ per share)	$ 3.08
Price Range $6.90 - $7.20
Options Outstanding, No of options	1,050
Options Outstanding, Wtd. avg. remaining life (in yrs.)	4 years 6 months 0 days
Options Outstanding, Wtd. avg. Exercise Price (US$ per share)	$ 6.94
Options Exercisable, No of options	1,050
Options Exercisable, Wtd. avg. Exercise Price (US$ per share)	$ 6.94
Price Range $10.00 - $11.70
Options Outstanding, No of options	1,790
Options Outstanding, Wtd. avg. remaining life (in yrs.)	2 years 8 months 1 day
Options Outstanding, Wtd. avg. Exercise Price (US$ per share)	$ 10.80
Options Exercisable, No of options	1,790
Options Exercisable, Wtd. avg. Exercise Price (US$ per share)	$ 10.80
Price Range $15.00
Options Outstanding, No of options	650
Options Outstanding, Wtd. avg. remaining life (in yrs.)	1 year 0 months 0 days
Options Outstanding, Wtd. avg. Exercise Price (US$ per share)	$ 15.05
Options Exercisable, No of options	650
Options Exercisable, Wtd. avg. Exercise Price (US$ per share)	$ 15.05

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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X

- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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