Cash, Cash Equivalents and Marketable Securities (Details) (USD $)
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Mar. 28, 2015
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Dec. 31, 2014
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Mar. 29, 2014
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Dec. 31, 2013
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Cash and Cash Equivalents [Line Items] |
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Cash and cash equivalents |
$ 29,618,000us-gaap_CashAndCashEquivalentsAtCarryingValue |
$ 48,829,000us-gaap_CashAndCashEquivalentsAtCarryingValue |
$ 75,169,000us-gaap_CashAndCashEquivalentsAtCarryingValue |
$ 82,747,000us-gaap_CashAndCashEquivalentsAtCarryingValue |
Marketable securities |
68,157,000us-gaap_AvailableForSaleSecurities |
62,850,000us-gaap_AvailableForSaleSecurities |
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Total cash, cash equivalents and marketable securities |
97,775,000calx_CashCashEquivalentsAndMarketableSecurities |
111,679,000calx_CashCashEquivalentsAndMarketableSecurities |
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Available-for-sale securities in a continuous unrealized loss position in excess of twelve months |
0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss |
0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss |
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Corporate debt securities |
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Cash and Cash Equivalents [Line Items] |
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Marketable securities |
63,063,000us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |
61,050,000us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |
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Commercial paper |
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Cash and Cash Equivalents [Line Items] |
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Marketable securities |
5,094,000us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember |
1,800,000us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember |
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Cash |
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Cash and Cash Equivalents [Line Items] |
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Cash and cash equivalents |
13,838,000us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CashMember |
17,866,000us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CashMember |
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Money market funds |
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Cash and Cash Equivalents [Line Items] |
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Cash and cash equivalents |
$ 15,780,000us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MoneyMarketFundsMember |
$ 30,963,000us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_CashAndCashEquivalentsAxis = us-gaap_MoneyMarketFundsMember |
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