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2004 Plan outstanding and exercisable options by price range (Details)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Weighted average remaining life (in yrs.)	5 years 9 months 29 days
Price Range $0.95 - $1.10
Range of exercise	$ 0.95
Range of exercise	$ 1.10
Number outstanding options | shares	414,303
Weighted average remaining life (in yrs.)	7 years 6 months 29 days
Weighted average exercise price (US$ per share)	$ 1.01
Number exercisable options | shares	270,686
Weighted average exercise price	$ 1.03
Price Range $1.20 - $1.25
Range of exercise	1.20
Range of exercise	$ 1.25
Number outstanding options | shares	58,000
Weighted average remaining life (in yrs.)	7 years 6 months
Weighted average exercise price (US$ per share)	$ 1.22
Number exercisable options | shares	41,583
Weighted average exercise price	$ 1.21
Price Range $1.50 - $1.82
Range of exercise	1.50
Range of exercise	$ 1.82
Number outstanding options | shares	186,857
Weighted average remaining life (in yrs.)	6 years 3 months 29 days
Weighted average exercise price (US$ per share)	$ 1.7
Number exercisable options | shares	184,532
Weighted average exercise price	$ 1.7
Price Range $1.89 - $2.27
Range of exercise	1.89
Range of exercise	$ 2.27
Number outstanding options | shares	539,695
Weighted average remaining life (in yrs.)	7 years 3 months
Weighted average exercise price (US$ per share)	$ 2.11
Number exercisable options | shares	314,964
Weighted average exercise price	$ 2.04
Price Range $2.36 - $2.74
Range of exercise	2.36
Range of exercise	$ 2.74
Number outstanding options | shares	260,379
Weighted average remaining life (in yrs.)	2 years 5 months 1 day
Weighted average exercise price (US$ per share)	$ 2.48
Number exercisable options | shares	172,601
Weighted average exercise price	$ 2.51
Price Range $3.04 - $3.45
Range of exercise	3.04
Range of exercise	$ 3.45
Number outstanding options | shares	560,819
Weighted average remaining life (in yrs.)	4 years 6 months
Weighted average exercise price (US$ per share)	$ 3.08
Number exercisable options | shares	560,819
Weighted average exercise price	$ 3.08
Price Range $6.90
Range of exercise	6.90
Range of exercise	$ 6.90
Number outstanding options | shares	900
Weighted average remaining life (in yrs.)	2 years 7 months 29 days
Weighted average exercise price (US$ per share)	$ 6.9
Number exercisable options | shares	900
Weighted average exercise price	$ 6.9
Price Range $10.00 - $11.70
Range of exercise	10.00
Range of exercise	$ 11.70
Number outstanding options | shares	1,400
Weighted average remaining life (in yrs.)	9 months
Weighted average exercise price (US$ per share)	$ 10.73
Number exercisable options | shares	1,400
Weighted average exercise price	$ 10.73
Price Range $0.95 - $11.70
Range of exercise	0.95
Range of exercise	$ 11.70
Number outstanding options | shares	2,022,353
Weighted average remaining life (in yrs.)	5 years 9 months 29 days
Weighted average exercise price (US$ per share)	$ 2.15
Number exercisable options | shares	1,547,485
Weighted average exercise price	$ 2.24

X

- Definition

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
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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
-Topic 718
-SubTopic 10
-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

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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
-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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- Definition

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
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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