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2004 Plan outstanding and exercisable options by price range (Details) | 12 Months Ended
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Dec. 31, 2016 $ / shares shares
Weighted average remaining life (in yrs.) | 5 years 6 months 29 days
Price Range $0.95 - $1.10 |
Range of exercise | $ 0.95
Range of exercise | $ 1.10
Number outstanding options | shares | 369,444
Weighted average remaining life (in yrs.) | 6 years 6 months 29 days
Weighted average exercise price (US$ per share) | $ 1.01
Number exercisable options | shares | 306,603
Weighted average exercise price | $ 1.02
Price Range $1.20 - $1.25 |
Range of exercise | 1.20
Range of exercise | $ 1.25
Number outstanding options | shares | 56,000
Weighted average remaining life (in yrs.) | 6 years 6 months
Weighted average exercise price (US$ per share) | $ 1.23
Number exercisable options | shares | 46,583
Weighted average exercise price | $ 1.22
Price Range $1.50 - $1.82 |
Range of exercise | 1.50
Range of exercise | $ 1.82
Number outstanding options | shares | 167,767
Weighted average remaining life (in yrs.) | 5 years 3 months 29 days
Weighted average exercise price (US$ per share) | $ 1.71
Number exercisable options | shares | 167,767
Weighted average exercise price | $ 1.71
Price Range $1.89 - $2.27 |
Range of exercise | 1.89
Range of exercise | $ 2.27
Number outstanding options | shares | 477,090
Weighted average remaining life (in yrs.) | 6 years 6 months
Weighted average exercise price (US$ per share) | $ 2.13
Number exercisable options | shares | 347,672
Weighted average exercise price | $ 2.08
Price Range $2.36 - $2.92 |
Range of exercise | 2.36
Range of exercise | $ 2.92
Number outstanding options | shares | 525,638
Weighted average remaining life (in yrs.) | 5 years 6 months 29 days
Weighted average exercise price (US$ per share) | $ 2.63
Number exercisable options | shares | 232,617
Weighted average exercise price | $ 2.54
Price Range $3.04 - $3.54 |
Range of exercise | 3.04
Range of exercise | $ 3.54
Number outstanding options | shares | 528,446
Weighted average remaining life (in yrs.) | 3 years 8 months 2 days
Weighted average exercise price (US$ per share) | $ 3.09
Number exercisable options | shares | 516,513
Weighted average exercise price | $ 3.08
Price Range $3.70 - $3.84 |
Range of exercise | 3.70
Range of exercise | $ 3.84
Number outstanding options | shares | 35,000
Weighted average remaining life (in yrs.) | 9 years 5 months 1 day
Weighted average exercise price (US$ per share) | $ 3.72
Number exercisable options | shares | 18,833
Weighted average exercise price | $ 3.71
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.) | 1 year 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 $10.00 |
Range of exercise | 10.00
Range of exercise | $ 10.00
Number outstanding options | shares | 800
Weighted average remaining life (in yrs.) | 2 months 1 day
Weighted average exercise price (US$ per share) | $ 10.00
Number exercisable options | shares | 800
Weighted average exercise price | $ 10.00
Price Range $0.95 - $10.00 |
Range of exercise | 0.95
Range of exercise | $ 10.00
Number outstanding options | shares | 2,161,085
Weighted average remaining life (in yrs.) | 5 years 6 months 29 days
Weighted average exercise price (US$ per share) | $ 2.27
Number exercisable options | shares | 1,638,288
Weighted average exercise price | $ 2.23

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- 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 + Details
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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 + Details
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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 + Details
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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 + Details
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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=6415400&loc=d3e5070-113901 + Details
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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 + Details
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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 + Details
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