2004 Plan outstanding and exercisable options by price range (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Number outstanding options	1,891,058
Weighted average remaining life (in yrs.)	6 years 3 months 29 days	6 years 6 months 29 days
Weighted average exercise price (US$ per share)	$ 2.09
Number exercisable options	1,430,394
Weighted average exercise price	$ 2.32
Price Range $0.95 - $1.10
Range of exercise	$ 0.95
Range of exercise	$ 1.10
Number outstanding options	478,986
Weighted average remaining life (in yrs.)	8 years 6 months 29 days
Weighted average exercise price (US$ per share)	$ 0.95
Number exercisable options	212,861
Weighted average exercise price	$ 1.05
Price Range $1.20 - $1.25
Range of exercise	$ 1.20
Range of exercise	$ 1.25
Number outstanding options	58,000
Weighted average remaining life (in yrs.)	8 years 6 months 0 days
Weighted average exercise price (US$ per share)	$ 1.22
Number exercisable options	30,583
Weighted average exercise price	$ 1.20
Price Range $1.50 - $1.80
Range of exercise	$ 1.50
Range of exercise	$ 1.80
Number outstanding options	207,088
Weighted average remaining life (in yrs.)	7 years 4 months 0 days
Weighted average exercise price (US$ per share)	$ 1.71
Number exercisable options	180,747
Weighted average exercise price	$ 1.72
Price Range $1.89 - $2.27
Range of exercise	$ 1.89
Range of exercise	$ 2.27
Number outstanding options	340,035
Weighted average remaining life (in yrs.)	6 years 5 months 1 day
Weighted average exercise price (US$ per share)	$ 2.03
Number exercisable options	275,923
Weighted average exercise price	$ 2.04
Price Range $2.35 - $2.74
Range of exercise	$ 2.23
Range of exercise	$ 2.74
Number outstanding options	225,967
Weighted average remaining life (in yrs.)	2 years 0 months 0 days
Weighted average exercise price (US$ per share)	$ 2.00
Number exercisable options	149,298
Weighted average exercise price	$ 2.52
Price Range $3.04 - $3.45
Range of exercise	$ 3.04
Range of exercise	$ 3.45
Number outstanding options	577,792
Weighted average remaining life (in yrs.)	5 years 6 months 0 days
Weighted average exercise price (US$ per share)	$ 3.08
Number exercisable options	577,792
Weighted average exercise price	$ 3.08
Price Range $6.90 - $7.20
Range of exercise	$ 6.90
Range of exercise	$ 7.20
Number outstanding options	1,050
Weighted average remaining life (in yrs.)	3 years 6 months 0 days
Weighted average exercise price (US$ per share)	$ 6.94
Number exercisable options	1,050
Weighted average exercise price	$ 6.94
Price Range $10.00 - $11.70
Range of exercise	$ 10.00
Range of exercise	$ 11.70
Number outstanding options	1,790
Weighted average remaining life (in yrs.)	1 year 8 months 1 day
Weighted average exercise price (US$ per share)	$ 10.80
Number exercisable options	1,790
Weighted average exercise price	$ 10.80
Price Range $15.00
Range of exercise	$ 15.00
Range of exercise	$ 15.00
Number outstanding options	350
Weighted average remaining life (in yrs.)	0 years 0 months 29 days
Weighted average exercise price (US$ per share)	$ 15.00
Number exercisable options	350
Weighted average exercise price	$ 15.00

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.

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)

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

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

-Publisher FASB

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

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

-Publisher FASB

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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

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