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	$ (38,755)us-gaap_NetIncomeLoss	$ (43,337)us-gaap_NetIncomeLoss	$ (15,917)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,415	745	744
Stock-based compensation	5,153us-gaap_ShareBasedCompensation	3,268us-gaap_ShareBasedCompensation	2,541us-gaap_ShareBasedCompensation
Changes in valuation of warrant liability	(7,708)us-gaap_FairValueAdjustmentOfWarrants	15,099us-gaap_FairValueAdjustmentOfWarrants	(2,059)us-gaap_FairValueAdjustmentOfWarrants
Non-cash interest expense	131us-gaap_OtherNoncashIncomeExpense	(25)us-gaap_OtherNoncashIncomeExpense	20us-gaap_OtherNoncashIncomeExpense
Deferred income taxes	26us-gaap_DeferredIncomeTaxExpenseBenefit	27us-gaap_DeferredIncomeTaxExpenseBenefit	62us-gaap_DeferredIncomeTaxExpenseBenefit
Loss on disposal of fixed assets	3us-gaap_GainLossOnDispositionOfAssets	56us-gaap_GainLossOnDispositionOfAssets	0us-gaap_GainLossOnDispositionOfAssets
Changes in operating assets and liabilities:
Accounts receivable	632	(1,681)	1,652
Inventories	3,033us-gaap_IncreaseDecreaseInInventories	(1,813)us-gaap_IncreaseDecreaseInInventories	(3,740)us-gaap_IncreaseDecreaseInInventories
Other assets	(1,655)	286	(1,663)
Accounts payable	(973)	(1,512)	2,506
Accrued liabilities	(1,382)	2,121	1,971
Deferred revenue	269	104	(34)
Net cash used in operating activities	(39,811)	(26,662)	(13,917)
Investing activities
Capital expenditures	(2,106)	(663)	(81)
Purchases of investments	(25,981)us-gaap_PaymentsToAcquireInvestments	(30,146)us-gaap_PaymentsToAcquireInvestments	0us-gaap_PaymentsToAcquireInvestments
Proceeds from maturities of investments	24,915	1,631	287
Restricted cash	(175)	(14)	(1)
Net cash (used in) provided by investing activities	(3,347)	(29,192)	205
Financing activities
Net proceeds from exercise/purchase of equity incentives and warrants	11,592	1,684	332
Net proceeds from public offering	18,488	61,425	14,226
Proceeds from debt, net of discount	9,848	3,102	1,810
Repayment of debt	(3,474)us-gaap_RepaymentsOfLongTermDebt	(7,568)us-gaap_RepaymentsOfLongTermDebt	(1,457)us-gaap_RepaymentsOfLongTermDebt
Net cash provided by financing activities	36,454	58,643	14,911
Net (decrease) increase in cash and cash equivalents	(6,704)	2,789	1,199
Cash and cash equivalents, beginning of year	29,485	26,696	25,497
Cash and cash equivalents, end of year	22,781	29,485	26,696
Supplemental disclosures:
Non-cash conversion of preferred stock to common stock			9,496
Cash paid for interest	563us-gaap_InterestPaid	294us-gaap_InterestPaid	460us-gaap_InterestPaid
Cash paid for income taxes	177us-gaap_IncomeTaxesPaid	146us-gaap_IncomeTaxesPaid	162us-gaap_IncomeTaxesPaid
Non-cash settlement of warranty claim		$ 1,272cers_SettlementsOfWarrantyClaims

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