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2004 Plan outstanding and exercisable options by price range (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Options Outstanding, No of options	1,624,188	1,410,090
Options Outstanding, Wtd. avg. remaining life (in yrs.)	73 months
Options Outstanding, Wtd. avg. Exercise Price (US$ per share)	$ 2.47	$ 2.70	$ 2.88	$ 6.27
Options Exercisable, No of options	1,236,374
Price Range $1.03 - $1.20
Options Outstanding, No of options	194,600
Options Outstanding, Wtd. avg. remaining life (in yrs.)	9 years 11 months
Options Outstanding, Wtd. avg. Exercise Price (US$ per share)	$ 1.09
Options Exercisable, No of options	83,668
Options Exercisable, Wtd. avg. Exercise Price (US$ per share)	$ 1.13
Price Range $1.68 - $1.82
Options Outstanding, No of options	161,823
Options Outstanding, Wtd. avg. remaining life (in yrs.)	8 years 2 months
Options Outstanding, Wtd. avg. Exercise Price (US$ per share)	$ 1.82
Options Exercisable, No of options	73,349
Options Exercisable, Wtd. avg. Exercise Price (US$ per share)	$ 1.82
Price Range $1.95 - $2.12
Options Outstanding, No of options	227,110
Options Outstanding, Wtd. avg. remaining life (in yrs.)	6 years 9 months
Options Outstanding, Wtd. avg. Exercise Price (US$ per share)	$ 1.99
Options Exercisable, No of options	210,537
Options Exercisable, Wtd. avg. Exercise Price (US$ per share)	$ 1.99
Price Range $2.17 - $2.36
Options Outstanding, No of options	233,687
Options Outstanding, Wtd. avg. remaining life (in yrs.)	4 years
Options Outstanding, Wtd. avg. Exercise Price (US$ per share)	$ 2.29
Options Exercisable, No of options	99,184
Options Exercisable, Wtd. avg. Exercise Price (US$ per share)	$ 2.29
Price Range $2.49 - $3.04
Options Outstanding, No of options	693,279
Options Outstanding, Wtd. avg. remaining life (in yrs.)	7 years 7 months
Options Outstanding, Wtd. avg. Exercise Price (US$ per share)	$ 3.01
Options Exercisable, No of options	655,947
Options Exercisable, Wtd. avg. Exercise Price (US$ per share)	$ 3.02
Price Range $3.14 - $3.45
Options Outstanding, No of options	106,542
Options Outstanding, Wtd. avg. remaining life (in yrs.)	6 years 9 months
Options Outstanding, Wtd. avg. Exercise Price (US$ per share)	$ 3.34
Options Exercisable, No of options	106,542
Options Exercisable, Wtd. avg. Exercise Price (US$ per share)	$ 3.34
Price Range $6.90 - $7.20
Options Outstanding, No of options	2,307
Options Outstanding, Wtd. avg. remaining life (in yrs.)	7 years
Options Outstanding, Wtd. avg. Exercise Price (US$ per share)	$ 5.42
Options Exercisable, No of options	2,307
Options Exercisable, Wtd. avg. Exercise Price (US$ per share)	$ 7.03
Price Range $10.00 - $11.70
Options Outstanding, No of options	4,190
Options Outstanding, Wtd. avg. remaining life (in yrs.)	4 years 9 months
Options Outstanding, Wtd. avg. Exercise Price (US$ per share)	$ 11.07
Options Exercisable, No of options	4,190
Options Exercisable, Wtd. avg. Exercise Price (US$ per share)	$ 11.07
Price Range $15.00
Options Outstanding, No of options	650
Options Outstanding, Wtd. avg. remaining life (in yrs.)	2 years
Options Outstanding, Wtd. avg. Exercise Price (US$ 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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(c), d(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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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-Publisher FASB

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(b)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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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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-Number 123R

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- 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

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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