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2004 Plan outstanding and exercisable options by price range (Details)	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Weighted average remaining life (in yrs.)	5 years 29 days
Price Range $0.95 - $1.25
Range of exercise	$ 0.95
Range of exercise	$ 1.25
Number outstanding options | shares	385,323
Weighted average remaining life (in yrs.)	5 years 6 months 29 days
Weighted average exercise price (US$ per share)	$ 1.04
Number exercisable options | shares	373,337
Weighted average exercise price	$ 1.04
Price Range $1.50 - $1.82
Range of exercise	1.50
Range of exercise	$ 1.82
Number outstanding options | shares	150,255
Weighted average remaining life (in yrs.)	4 years 2 months 1 day
Weighted average exercise price (US$ per share)	$ 1.72
Number exercisable options | shares	150,255
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 | shares	429,362
Weighted average remaining life (in yrs.)	5 years 6 months 29 days
Weighted average exercise price (US$ per share)	$ 2.13
Number exercisable options | shares	357,912
Weighted average exercise price	$ 2.11
Price Range $2.36 - $2.92
Range of exercise	2.36
Range of exercise	$ 2.92
Number outstanding options | shares	485,823
Weighted average remaining life (in yrs.)	4 years 5 months 1 day
Weighted average exercise price (US$ per share)	$ 2.64
Number exercisable options | shares	309,530
Weighted average exercise price	$ 2.59
Price Range $3.04 - $3.54
Range of exercise	3.04
Range of exercise	$ 3.54
Number outstanding options | shares	503,063
Weighted average remaining life (in yrs.)	2 years 9 months 29 days
Weighted average exercise price (US$ per share)	$ 3.10
Number exercisable options | shares	482,605
Weighted average exercise price	$ 3.08
Price Range $3.70 - $4.49
Range of exercise	3.70
Range of exercise	$ 4.49
Number outstanding options | shares	292,300
Weighted average remaining life (in yrs.)	9 years 3 months 29 days
Weighted average exercise price (US$ per share)	$ 4.11
Number exercisable options | shares	71,634
Weighted average exercise price	$ 3.94
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.)	6 months 29 days
Weighted average exercise price (US$ per share)	$ 6.90
Number exercisable options | shares	900
Weighted average exercise price	$ 6.90
Price Range $0.95 - $6.90
Range of exercise	0.95
Range of exercise	$ 6.90
Number outstanding options | shares	2,247,026
Weighted average remaining life (in yrs.)	5 years 29 days
Weighted average exercise price (US$ per share)	$ 2.50
Number exercisable options | shares	1,746,173
Weighted average exercise price	$ 2.28

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=96867065&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=96867065&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=96867065&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=96867065&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
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&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=96867065&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=96867065&loc=d3e5070-113901

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