Revenue and Operating Income Information by Segment (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenue	$ 136,022us-gaap_Revenues	$ 120,010us-gaap_Revenues	$ 112,963us-gaap_Revenues
Gross profit	70,314us-gaap_GrossProfit	54,724us-gaap_GrossProfit	49,951us-gaap_GrossProfit
Gross margin	51.70%cscd_GrossMargin	45.60%cscd_GrossMargin	44.20%cscd_GrossMargin
Income (loss) from operations	13,284us-gaap_OperatingIncomeLoss	7,333us-gaap_OperatingIncomeLoss	7,557us-gaap_OperatingIncomeLoss
Amortization expense	3,011us-gaap_AmortizationOfIntangibleAssets	1,522us-gaap_AmortizationOfIntangibleAssets	1,082us-gaap_AmortizationOfIntangibleAssets
Corporate Unallocated
Segment Reporting Information [Line Items]
Income (loss) from operations	(15,037)	(14,029)	(12,252)
Systems
Segment Reporting Information [Line Items]
Amortization expense		1,200	700
Systems \| Operating Segments
Segment Reporting Information [Line Items]
Revenue	82,850	79,229	74,368
Gross profit	37,775	33,177	29,391
Gross margin	45.60%	41.90%	39.50%
Income (loss) from operations	7,553	9,794	9,651
Probes \| Operating Segments
Segment Reporting Information [Line Items]
Revenue	53,172	40,781	38,595
Gross profit	32,539	21,547	20,560
Gross margin	61.20%	52.80%	53.30%
Income (loss) from operations	$ 20,768	$ 11,568	$ 10,158

Gross margin.

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

+ Details

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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