Quarterly report pursuant to Section 13 or 15(d)

Equity - Additional Information (Details)

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Equity - Additional Information (Details) (USD $)
 9 Months Ended 0 Months Ended 1 Months Ended 1 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Feb. 12, 2014
IPO
Feb. 12, 2014
IPO
Underwriter Option
Feb. 28, 2014
Convertible Preferred Stock
Sep. 30, 2014
Convertible Preferred Stock
Dec. 31, 2013
Convertible Preferred Stock
Feb. 28, 2014
Common Stock
Sep. 30, 2014
Common Stock
Dec. 31, 2013
Common Stock
Feb. 28, 2014
Preferred Stock
Class Of Stock [Line Items]                      
Common stock, authorized 250,000,000 250,000,000             250,000,000 150,000,000  
Preferred stock, authorized 130,000,000 130,000,000       130,000,000 100,000,000        
Common stock shares, issued 50,583   3,682,900 182,900              
Common stock share issue price under IPO, per share price     $ 5.75                
Proceeds from issuance of common stock $ 15,369,000   $ 15,400,000                
Underwriting discounts and other offering costs     5,800,000                
Minimum denominator to calculate conversion ratio 8.00                    
Number of preferred stock converted to common shares         80,910,394            
Common stock shares issued upon conversion from preferred stock               8,029,779      
Value of preferred stock converted         $ 161,500,000            
Outstanding warrants exercisable               159,834     2,344,731
Restricted common stock issued, Shares, Termination of consulting agreement 50,000                    
Common stock shares issued upon vesting of restricted stock units 467,474