The Company and Basis of Presentation (Details 2)
12 Months Ended 0 Months Ended
Dec. 31, 2013
Jul. 02, 2013
Jul. 11, 2013
Jul. 11, 2013
Dec. 31, 2014
Jun. 30, 2013
Movement in Company's capitalization            
Balance (in shares)   14,607,413 15,357,413   20,352,876 396,414
Balance (in shares) 15,357,413 14,607,413 15,357,413 15,357,413 20,352,876 396,414
Series A preferred stock            
Movement in Company's capitalization            
Conversion of preferred stock into common stock upon closing of IPO (in shares) (57,598,092)          
Series A-1 preferred stock            
Movement in Company's capitalization            
Conversion of preferred stock into common stock upon closing of IPO (in shares) (6,750,000)          
Initial Public Offering | Series A preferred stock            
Movement in Company's capitalization            
Conversion of preferred stock into common stock upon closing of IPO (in shares)   8,244,781        
Initial Public Offering | Series A-1 preferred stock            
Movement in Company's capitalization            
Conversion of preferred stock into common stock upon closing of IPO (in shares)   966,218        
Initial Public Offering | Common stock            
Movement in Company's capitalization            
Conversion of preferred stock into common stock upon closing of IPO (in shares)   9,210,999        
Common stock sold (in shares)   5,000,000        
Over-allotment option            
Movement in Company's capitalization            
Common stock sold (in shares)     750,000 750,000