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Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 72,026us-gaap_CashAndCashEquivalentsAtCarryingValue $ 37,950us-gaap_CashAndCashEquivalentsAtCarryingValue
Marketable securities 12,015us-gaap_MarketableSecuritiesCurrent 11,326us-gaap_MarketableSecuritiesCurrent
Accounts receivable 215us-gaap_AccountsReceivableNetCurrent 440us-gaap_AccountsReceivableNetCurrent
Prepaid expenses and other current assets 686us-gaap_PrepaidExpenseAndOtherAssetsCurrent 153us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 84,942us-gaap_AssetsCurrent 49,869us-gaap_AssetsCurrent
Deferred financing fees 0us-gaap_DeferredFinanceCostsNoncurrentNet 2,739us-gaap_DeferredFinanceCostsNoncurrentNet
Property, plant and equipment, net (note 6) 2,476us-gaap_PropertyPlantAndEquipmentNet 1,879us-gaap_PropertyPlantAndEquipmentNet
Total assets 87,418us-gaap_Assets 54,487us-gaap_Assets
Current liabilities:    
Accounts payable and accrued expenses (note 7) 2,664us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 2,283us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Deferred revenue (note 8) 11,622us-gaap_DeferredRevenueCurrent 15,920us-gaap_DeferredRevenueCurrent
Total current liabilities 14,286us-gaap_LiabilitiesCurrent 18,203us-gaap_LiabilitiesCurrent
Deferred revenue, less current portion (note 8) 157us-gaap_DeferredRevenueNoncurrent 11,886us-gaap_DeferredRevenueNoncurrent
Deferred tenant inducements 196us-gaap_DeferredRentCreditNoncurrent 282us-gaap_DeferredRentCreditNoncurrent
Total liabilities 14,639us-gaap_Liabilities 30,371us-gaap_Liabilities
Redeemable convertible preferred shares (note 10):    
Convertible Preferred Stock   102,488us-gaap_PreferredStockValue
Shareholders’ deficit:    
Common shares, without par value; unlimited shares authorized; 14,181,333 and 1,344,627 issued and outstanding at December 31, 2014 and December 31, 2013, respectively. 147,157us-gaap_CommonStockValue 6,147us-gaap_CommonStockValue
Additional paid-in capital 30,346us-gaap_AdditionalPaidInCapital 29,722us-gaap_AdditionalPaidInCapital
Accumulated deficit (103,734)us-gaap_RetainedEarningsAccumulatedDeficit (116,752)us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated comprehensive income (loss) (990)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 2,511us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total shareholders’ deficit 72,779us-gaap_StockholdersEquity (78,372)us-gaap_StockholdersEquity
Total liabilities, shareholders’ deficit and redeemable convertible preferred shares 87,418us-gaap_LiabilitiesAndStockholdersEquity 54,487us-gaap_LiabilitiesAndStockholdersEquity
Series A Preferred Stock [Member]    
Redeemable convertible preferred shares (note 10):    
Convertible Preferred Stock   2,939us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Series B Preferred Stock [Member]    
Redeemable convertible preferred shares (note 10):    
Convertible Preferred Stock   8,683us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Series E Preferred Stock [Member]    
Redeemable convertible preferred shares (note 10):    
Convertible Preferred Stock   $ 90,866us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember