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BALANCE SHEETS (USD $)
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 49,720,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 10,037,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Prepaid expenses and other current assets 428,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 1,762,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 50,148,000us-gaap_AssetsCurrent 11,799,000us-gaap_AssetsCurrent
Property and equipment, net 44,000us-gaap_PropertyPlantAndEquipmentNet 16,000us-gaap_PropertyPlantAndEquipmentNet
Other assets 21,000us-gaap_OtherAssetsNoncurrent 9,000us-gaap_OtherAssetsNoncurrent
Total assets 50,213,000us-gaap_Assets 11,824,000us-gaap_Assets
Current liabilities:    
Accounts payable 536,000us-gaap_AccountsPayableCurrent 78,000us-gaap_AccountsPayableCurrent
Accrued expenses 1,503,000us-gaap_AccruedLiabilitiesCurrent 1,096,000us-gaap_AccruedLiabilitiesCurrent
Warrant liability   1,192,000us-gaap_WarrantsAndRightsOutstanding
Total current liabilities 2,039,000us-gaap_LiabilitiesCurrent 2,366,000us-gaap_LiabilitiesCurrent
Notes payable 7,000,000us-gaap_LongTermNotesPayable  
Other long term liabilities 20,000us-gaap_OtherAccruedLiabilitiesNoncurrent  
Total liabilities 9,059,000us-gaap_Liabilities 2,366,000us-gaap_Liabilities
Commitments and contingencies (Note 9)      
Stockholders' equity (deficit):    
Preferred stock, $0.001 par value; 25,000,000 shares authorized, no shares issued and outstanding      
Common stock, $0.001 par value; 100,000,000 shares authorized, 14,036,985 issued and 14,007,754 outstanding at December 31, 2014 and 494,260 issued and 465,029 outstanding at December 31, 2013 14,000us-gaap_CommonStockValue 1,000us-gaap_CommonStockValue
Additional paid-in capital 113,476,000us-gaap_AdditionalPaidInCapital 1,121,000us-gaap_AdditionalPaidInCapital
Treasury stock at cost, 29,231 shares at December 31, 2014 and 2013      
Accumulated deficit (72,336,000)us-gaap_RetainedEarningsAccumulatedDeficit (61,503,000)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity (deficit) 41,154,000us-gaap_StockholdersEquity (60,381,000)us-gaap_StockholdersEquity
Total liabilities and stockholders' equity (deficit) 50,213,000us-gaap_LiabilitiesAndStockholdersEquity 11,824,000us-gaap_LiabilitiesAndStockholdersEquity
Series A Preferred Stock    
Current liabilities:    
Convertible preferred stock   30,596,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= mrns_SeriesAConvertiblePreferredStockMember
Series B Preferred Stock    
Current liabilities:    
Convertible preferred stock   17,929,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= mrns_SeriesBConvertiblePreferredStockMember
Series C Preferred Stock    
Current liabilities:    
Convertible preferred stock   $ 21,314,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= mrns_SeriesCConvertiblePreferredStockMember