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Consolidated Statements of Stockholders' Equity (Deficit) (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 0 Months Ended
Mar. 31, 2015
Apr. 22, 2015
Stock issuance costs $ 5,163us-gaap_PaymentsOfStockIssuanceCosts  
Subsequent event | Underwriters Overallotment Option Exercise    
Common stock issued (in shares)   165,452us-gaap_StockIssuedDuringPeriodSharesNewIssues
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Net proceeds from the issuance of common stock   $ 1,308us-gaap_ProceedsFromIssuanceOfCommonStock
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Ordinary Shares    
Common stock issued (in shares) 4,700,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
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