CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
Apr. 04, 2015	Mar. 29, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (1,021)us-gaap_NetIncomeLoss	$ (1,574)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	220	187
Share-based compensation	301us-gaap_ShareBasedCompensation	174us-gaap_ShareBasedCompensation
Deferred tax expense	170us-gaap_DeferredIncomeTaxExpenseBenefit	29us-gaap_DeferredIncomeTaxExpenseBenefit
Discount on note payable	0	1,265
Change in fair value of warrants and derivative liabilities	125us-gaap_FairValueAdjustmentOfWarrants	17us-gaap_FairValueAdjustmentOfWarrants
Incentive warrants expense	38crtn_IncentiveWarrantsExpense	0crtn_IncentiveWarrantsExpense
Other changes in operating assets and liabilities:
Accounts receivable, net	2,504	(5,460)
Prepaid and other assets	(290)	93
Trade accounts payable	528	1,036
Deferred revenue	772	959
Accrued severance liability and related costs	(1,694)	0
Accrued liabilities	54	628
Net cash provided by (used in) operating activities	1,707	(2,646)
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property and equipment	(370)	(67)
Net cash used in investing activities	(370)	(67)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repurchase of common stock	(92)	(14)
Borrowing on note payable	0us-gaap_ProceedsFromNotesPayable	3,269us-gaap_ProceedsFromNotesPayable
Issuance of common stock	0	2,000
Equity issuance costs	0us-gaap_PaymentsOfStockIssuanceCosts	(129)us-gaap_PaymentsOfStockIssuanceCosts
Net cash (used in) provided by financing activities	(92)	5,126
Effect of exchange rate on cash and cash equivalents	(405)	43
Net increase in cash and cash equivalents	840	2,456
Cash and cash equivalents, beginning of period	12,999	13,780
Cash and cash equivalents, end of period	13,839	16,236
Supplemental disclosure of cash flow information:
Cash paid during period for interest	63us-gaap_InterestPaid	0us-gaap_InterestPaid
Accrued property and equipment additions	$ 317	$ 158

Expense associated with incentive warrants earned by a strategic alliance partner.

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- Details

Name:	us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration