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Goodwill and intangible assets (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Indefinite-lived Intangible Assets [Line Items] |  |
GrossCarryingAmount | $ 4,686 | $ 4,687
AccumulatedAmortization | 1,387 | 900
Net | $ 3,299 | 3,787
License Agreement Terms [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Amortization Period(in years) | 10 years |
GrossCarryingAmount | $ 1,000 | 1,000
AccumulatedAmortization | 217 | 117
Net | $ 783 | 883
Trade Names [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Amortization Period(in years) | 2 years |
GrossCarryingAmount | $ 30 | 30
AccumulatedAmortization | 30 | 24
Net | $ 0 | 6
Patents [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Amortization Period(in years) | 5 years |
GrossCarryingAmount | $ 386 | 387
AccumulatedAmortization | 366 | 352
Net | 20 | 35
Noncompete Agreements [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
GrossCarryingAmount | 1,270 | 1,270
AccumulatedAmortization | 322 | 171
Net | $ 948 | 1,099
Noncompete Agreements [Member] | Maximum [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Amortization Period(in years) | 10 years |
Noncompete Agreements [Member] | Minimum [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Amortization Period(in years) | 6 years |
Customer Relationships [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
GrossCarryingAmount | $ 2,000 | 2,000
AccumulatedAmortization | 452 | 236
Net | $ 1,548 | $ 1,764
Customer Relationships [Member] | Maximum [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Amortization Period(in years) | 10 years |
Customer Relationships [Member] | Minimum [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Amortization Period(in years) | 3 years |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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