Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities:
Net loss	$ (20,814)us-gaap_ProfitLoss	$ (17,265)us-gaap_ProfitLoss	$ (28,326)us-gaap_ProfitLoss
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	9,263us-gaap_Depreciation	10,181us-gaap_Depreciation	8,562us-gaap_Depreciation
Loss on retirement of property and equipment	50us-gaap_GainLossOnDispositionOfAssets	569us-gaap_GainLossOnDispositionOfAssets	262us-gaap_GainLossOnDispositionOfAssets
Amortization of intangible assets	18,561us-gaap_AmortizationOfIntangibleAssets	18,561us-gaap_AmortizationOfIntangibleAssets	17,747us-gaap_AmortizationOfIntangibleAssets
Amortization of premiums relating to available-for-sale securities	574	0	0
Gain on sale of available-for-sale securities	(1)us-gaap_GainLossOnSaleOfInvestments	0us-gaap_GainLossOnSaleOfInvestments	0us-gaap_GainLossOnSaleOfInvestments
Stock-based compensation	16,017us-gaap_ShareBasedCompensation	19,921us-gaap_ShareBasedCompensation	17,437us-gaap_ShareBasedCompensation
Utilization of inventory credit	0calx_UtilizationOfInventoryCredit	(1,651)calx_UtilizationOfInventoryCredit	0calx_UtilizationOfInventoryCredit
Gain on bargain purchase	0	0	(1,029)
Changes in operating assets and liabilities:
Restricted cash	0	(295)	754
Accounts receivable, net	12,776	15,999	(13,011)
Inventory	4,319us-gaap_IncreaseDecreaseInInventories	(6,138)us-gaap_IncreaseDecreaseInInventories	11,308us-gaap_IncreaseDecreaseInInventories
Deferred cost of revenue	15,996	1	(13,379)
Prepaid expenses and other assets	(5,908)	535	47
Accounts payable	467	6,359	2,554
Accrued liabilities	7,440	(4,217)	(869)
Deferred revenue	(21,178)	(1,804)	26,403
Other long-term liabilities	513	62	(782)
Net cash provided by operating activities	38,075	40,818	27,678
Investing activities:
Purchases of property and equipment	(11,961)	(6,987)	(10,179)
Purchases of marketable securities	(67,698)	0	0
Sales of marketable securities	615	0	0
Maturities of marketable securities	3,600	0	0
Acquisitions, net of cash acquired	0	0	(12,000)
Net cash used in investing activities	(75,444)	(6,987)	(22,179)
Financing activities:
Proceeds from exercise of stock options	1,668	747	194
Proceeds from employee stock purchase plan	4,627	4,828	4,063
Taxes paid for awards vested under equity incentive plans	(2,720)	(3,441)	(1,744)
Payments for debt issuance costs	0us-gaap_PaymentsOfDebtIssuanceCosts	(316)us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts
Net cash provided by financing activities	3,575	1,818	2,513
Effect of exchange rate changes on cash and cash equivalents	(124)	103	45
Net increase (decrease) in cash and cash equivalents	(33,918)	35,752	8,057
Cash and cash equivalents at beginning of period	82,747	46,995	38,938
Cash and cash equivalents at end of period	48,829	82,747	46,995
Supplemental disclosures of cash flow information
Interest paid	159us-gaap_InterestPaid	57us-gaap_InterestPaid	68us-gaap_InterestPaid
Income taxes paid	72us-gaap_IncomeTaxesPaidNet	96us-gaap_IncomeTaxesPaidNet	125us-gaap_IncomeTaxesPaidNet
Non-cash financing and investing activities
Property and equipment acquired using credits from Ericsson Inc.	$ 0	$ 125	$ 0

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Cash outflow for purchase of trading, available-for-sale securities and held-to-maturity securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 45

-Paragraph 13

-Subparagraph (a),(b)

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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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The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

+ References

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

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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-Name Accounting Standards Codification

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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.

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

-Publisher FASB

-Name Accounting Standards Codification

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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-Publisher FASB

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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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