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Stockholders' equity - Summary of Options Outstanding and Exercisable (Details) | 12 Months Ended
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Dec. 31, 2018 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Number of options outstanding (in shares) | 339,964
Number of options exercisable (in shares) | 303,986
Weighted average exercise price of outstanding options (in dollars per share) | $ / shares | $ 6.94
$2.50 - $5.70 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Number of options outstanding (in shares) | 204,034
Weighted average remaining estimated life (in years) | 5 years 7 months 6 days
Number of options exercisable (in shares) | 185,985
$6.90 - $9.60 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Number of options outstanding (in shares) | 53,175
Weighted average remaining estimated life (in years) | 3 years 8 months 12 days
Number of options exercisable (in shares) | 53,175
$10.50 - $10.80 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Number of options outstanding (in shares) | 4,000
Weighted average remaining estimated life (in years) | 5 years 1 month 6 days
Number of options exercisable (in shares) | 4,000
$14.20 - $23.40 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Number of options outstanding (in shares) | 78,755
Weighted average remaining estimated life (in years) | 7 years 2 months 12 days
Number of options exercisable (in shares) | 60,826
Minimum | $2.50 - $5.70 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Weighted average exercise price of outstanding options (in dollars per share) | $ / shares | $ 2.50
Minimum | $6.90 - $9.60 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Weighted average exercise price of outstanding options (in dollars per share) | $ / shares | 6.90
Minimum | $10.50 - $10.80 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Weighted average exercise price of outstanding options (in dollars per share) | $ / shares | 10.50
Minimum | $14.20 - $23.40 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Weighted average exercise price of outstanding options (in dollars per share) | $ / shares | 14.20
Maximum | $2.50 - $5.70 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Weighted average exercise price of outstanding options (in dollars per share) | $ / shares | 5.70
Maximum | $6.90 - $9.60 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Weighted average exercise price of outstanding options (in dollars per share) | $ / shares | 9.60
Maximum | $10.50 - $10.80 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Weighted average exercise price of outstanding options (in dollars per share) | $ / shares | 10.80
Maximum | $14.20 - $23.40 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Weighted average exercise price of outstanding options (in dollars per share) | $ / shares | $ 23.40

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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