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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 51,174us-gaap_CashAndCashEquivalentsAtCarryingValue $ 5,488us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, prepaid expenses, and other current assets 1,662ceru_AccountsReceivablePrepaidExpenseAndOtherCurrentAssets 959ceru_AccountsReceivablePrepaidExpenseAndOtherCurrentAssets
Total current assets 52,836us-gaap_AssetsCurrent 6,447us-gaap_AssetsCurrent
Property and equipment — Net 342us-gaap_PropertyPlantAndEquipmentNet 245us-gaap_PropertyPlantAndEquipmentNet
Other assets 215us-gaap_OtherAssetsNoncurrent 135us-gaap_OtherAssetsNoncurrent
Total 53,393us-gaap_Assets 6,827us-gaap_Assets
Current liabilities:    
Current portion of loan payable 3,124us-gaap_LoansPayableCurrent 3,134us-gaap_LoansPayableCurrent
Convertible promissory notes payable to shareholders   8,824us-gaap_ConvertibleNotesPayableCurrent
Accounts payable 1,255us-gaap_AccountsPayableCurrent 914us-gaap_AccountsPayableCurrent
Accrued expenses 3,648us-gaap_AccruedLiabilitiesCurrent 2,274us-gaap_AccruedLiabilitiesCurrent
Other liabilities 34us-gaap_OtherLiabilitiesCurrent  
Total current liabilities 8,061us-gaap_LiabilitiesCurrent 15,146us-gaap_LiabilitiesCurrent
Long-term liabilities:    
Loan payable — net of current portion   3,124us-gaap_LongTermLoansPayable
Preferred stock warrant liability   928us-gaap_WarrantsAndRightsOutstanding
Noncurrent accrued interest   391us-gaap_InterestPayableCurrentAndNoncurrent
Other 7us-gaap_OtherLiabilitiesNoncurrent 12us-gaap_OtherLiabilitiesNoncurrent
Total long-term liabilities 7us-gaap_LiabilitiesNoncurrent 4,455us-gaap_LiabilitiesNoncurrent
Redeemable convertible preferred stock (Note 8)   81,525us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital
Commitments (Note 13)      
Stockholders’ equity (deficit):    
Preferred stock, $0.01 par value; 5,000,000 shares authorized, no shares issued or outstanding 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Common stock, $0.0001 par value; 120,000,000 shares authorized, 20,125,049 and 785,531 shares issued and outstanding at December 31, 2014 and 2013, respectively 2us-gaap_CommonStockValue  
Additional paid-in capital 167,104us-gaap_AdditionalPaidInCapital 4,140us-gaap_AdditionalPaidInCapital
Accumulated deficit (121,781)us-gaap_RetainedEarningsAccumulatedDeficit (98,439)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders’ equity (deficit) 45,325us-gaap_StockholdersEquity (94,299)us-gaap_StockholdersEquity
Total $ 53,393us-gaap_LiabilitiesAndStockholdersEquity $ 6,827us-gaap_LiabilitiesAndStockholdersEquity