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Summary of significant accounting policies and recent accounting pronouncements - Narrative (Details) (USD $)
 0 Months Ended 1 Months Ended 3 Months Ended
Feb. 03, 2015
Jan. 15, 2015
Mar. 31, 2014
Mar. 31, 2015
Feb. 03, 2015
Dec. 31, 2014
Subsidiary, Sale of Stock [Line Items]            
Proceeds from initial public offering, net of offering costs $ 79,900,000us-gaap_ProceedsFromIssuanceInitialPublicOffering   $ 0us-gaap_ProceedsFromIssuanceInitialPublicOffering $ 80,435,430us-gaap_ProceedsFromIssuanceInitialPublicOffering    
Common stock, number of shares issued from conversion of preferred stock (in shares) 6,971,108us-gaap_ConversionOfStockSharesConverted1          
Common stock, shares authorized       100,000,000us-gaap_CommonStockSharesAuthorized   61,000,000us-gaap_CommonStockSharesAuthorized
IPO issuance cost $ 1,848,737us-gaap_DeferredOfferingCosts       $ 1,848,737us-gaap_DeferredOfferingCosts  
Reverse stock split conversion ratio   0.2335us-gaap_StockholdersEquityNoteStockSplitConversionRatio1        
IPO [Member]            
Subsidiary, Sale of Stock [Line Items]            
Common stock, shares issued 5,491,191us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember		          
Common stock, price per share (in usd per share) $ 16.00us-gaap_SharesIssuedPricePerShare
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember		       $ 16.00us-gaap_SharesIssuedPricePerShare
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember		  
Over-Allotment Option [Member]            
Subsidiary, Sale of Stock [Line Items]            
Common stock, shares issued 91,191us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_OverAllotmentOptionMember