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Subsequent Events (Details) - USD ($)
$ in Millions
Nov. 06, 2015
Sep. 30, 2015
Dec. 31, 2014
Subsequent Event [Line Items]      
Line of credit, outstanding   $ 2.7 $ 4.4
Silicon Valley Bank (SVB) | Revolving line of credit      
Subsequent Event [Line Items]      
Line of credit, outstanding   $ 2.7  
Silicon Valley Bank (SVB) | Revolving line of credit | Subsequent events      
Subsequent Event [Line Items]      
Threshold limit of liquidity covenant $ 2.5