Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 19,918us-gaap_NetIncomeLoss	$ 18,244us-gaap_NetIncomeLoss	$ 14,738us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,317	5,131	6,519
Loss (gain) on write-down / disposal of property and equipment, net	17us-gaap_GainLossOnDispositionOfAssets	(27)us-gaap_GainLossOnDispositionOfAssets	161us-gaap_GainLossOnDispositionOfAssets
Loss on disposal of intangibles	215	168	195
Bond premium amortization	957	289	29
Provision (recovery) for doubtful accounts	142us-gaap_ProvisionForDoubtfulAccounts	24us-gaap_ProvisionForDoubtfulAccounts	(242)us-gaap_ProvisionForDoubtfulAccounts
Provision for excess and obsolete inventory	2,157	595	554
Provision for warranty	396	1,001	527
Stock-based compensation	5,579us-gaap_ShareBasedCompensation	4,340us-gaap_ShareBasedCompensation	3,422us-gaap_ShareBasedCompensation
Deferred income taxes	3,598us-gaap_DeferredIncomeTaxExpenseBenefit	621us-gaap_DeferredIncomeTaxExpenseBenefit	1,683us-gaap_DeferredIncomeTaxExpenseBenefit
Unrecognized tax benefits	202	219	920
Excess tax benefit from stock-based compensation	(7,985)	(6,797)	(4,713)
Change in assets and liabilities:
Accounts and notes receivable	(8,389)	(4,411)	(6,080)
Inventory	(9,371)us-gaap_IncreaseDecreaseInInventories	(711)us-gaap_IncreaseDecreaseInInventories	(62)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	(1,080)	(569)	177
Accounts payable, accrued and other liabilities	9,456	5,559	4,433
Deferred revenue	15,469	8,096	4,169
Customer deposits	(166)	654	87
Net cash provided by operating activities	35,432	32,426	26,517
Cash flows from investing activities:
Purchases of investments	(32,900)us-gaap_PaymentsToAcquireInvestments	(29,112)us-gaap_PaymentsToAcquireInvestments	(6,242)us-gaap_PaymentsToAcquireInvestments
Proceeds from call / maturity of investments	10,997	9,380	9,640
Purchases of property and equipment	(2,505)	(1,783)	(1,334)
Proceeds from disposal of fixed assets	10	34	46
Purchases of intangible assets	(183)	(323)	(429)
Business acquisition, net of cash acquired	0	(1,258)
Net cash (used in) provided by investing activities	(24,581)	(23,062)	1,681
Cash flows from financing activities:
Repurchase of common stock	(22,442)	(25,000)	(19,996)
Proceeds from options exercised	11,000	15,357	1,929
Payroll tax payments for net-settled stock awards	(1,347)	(309)
Payments on capital lease obligation	(36)	(34)	(9)
Excess tax benefit from stock-based compensation	7,985	6,797	4,713
Net cash used in financing activities	(4,840)	(3,189)	(13,363)
Effect of exchange rate changes on cash and cash equivalents	85	(31)	(9)
Net increase in cash and cash equivalents	6,096	6,144	14,826
Cash and cash equivalents, beginning of year	42,271	36,127	21,301
Cash and cash equivalents, end of year	$ 48,367	$ 42,271	$ 36,127

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The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

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- Definition

The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

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- Definition

The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

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Data Type:	xbrli:monetaryItemType
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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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- Definition

The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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- Definition

Represents the aggregate Increase or Decrease in the liability during the reporting period for accruals related to preexisting standard product warranties (including adjustments related to changes in estimates). Does not include any Increase or Decrease in the liability for accruals related to extended product warranties.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(4))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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