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Statements of Changes in Stockholders' Equity (Deficit) - USD ($)
shares in Thousands, $ in Thousands
Total
Series A Convertible Preferred Stock
Series B Convertible Preferred Stock
Series B-1 Convertible Preferred Stock
Series C Convertible Preferred Stock
Series C Preferred Stock Warrants
Common Stock
Common Stock
Series A Convertible Preferred Stock
Common Stock
Series B Convertible Preferred Stock
Common Stock
Series B-1 Convertible Preferred Stock
Common Stock
Series C Convertible Preferred Stock
Common Stock
Series C Preferred Stock Warrants
Additional Paid-in Capital
Additional Paid-in Capital
Series A Convertible Preferred Stock
Additional Paid-in Capital
Series B Convertible Preferred Stock
Additional Paid-in Capital
Series B-1 Convertible Preferred Stock
Additional Paid-in Capital
Series C Convertible Preferred Stock
Additional Paid-in Capital
Series C Preferred Stock Warrants
Accumulated Deficit
Number of shares outstanding, beginning balance (in shares) at Sep. 30, 2012             1,653                        
Stockholders' equity attributable to parent, beginning balance at Sep. 30, 2012 $ (93,433)           $ 2           $ 2,102           $ (95,537)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Stock-based compensation expense 317                       317            
Conversion of preferred shares to common stock, (in shares)               825 524 46                  
Conversion of preferred shares to common stock, value   $ 5,136 $ 6,111 $ 539       $ 1 $ 0 $ 0       $ 5,135 $ 6,111 $ 539      
Net income (loss) (6,048)                                   (6,048)
Dividends on Convertible Preferred Stock (3,837)                                   (3,837)
Forfeitures of dividends on Convertible Preferred Stock 3,286                                   3,286
Number of shares outstanding, ending balance (in shares) at Sep. 30, 2013             3,048                        
Stockholders' equity attributable to parent, ending balance at Sep. 30, 2013 (87,929)           $ 3           14,204           (102,136)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Stock-based compensation expense 606                       606            
Issuance of common stock in connection with initial public offering, including underwriter's over-allotment, net of offering costs and underwriter's discount (in shares)             3,450                        
Issuance of common stock in connection with initial public offering, including underwriter's over-allotment, net of offering costs and underwriter's discount 46,048           $ 3           46,045            
Conversion of preferred shares to common stock, (in shares)               2,332 1,980 1,456 1,720 32              
Conversion of preferred shares to common stock, value   $ 20,377 $ 30,612 $ 19,756 $ 20,903 $ 2,280   $ 3 $ 2 $ 1 $ 2 $ 0   $ 20,374 $ 30,610 $ 19,755 $ 20,901 $ 2,280  
Issuance of common stock upon exercise of Redeemable Series C Preferred Stock warrants (in shares)             2                        
Issuance of common stock upon exercise of Redeemable Series C Preferred Stock warrants 21           $ 0           21            
Issuance of common stock upon exercise of stock option grants (in shares)             12                        
Issuance of common stock upon exercise of stock option grants 65           $ 0           65            
Dividends on Convertible Preferred Stock and forfeitures of dividends on conversion to common 0                       (17,602)           17,602
Net income (loss) (17,977)                                   (17,977)
Dividends on Convertible Preferred Stock (1,666)                                   (1,666)
Number of shares outstanding, ending balance (in shares) at Sep. 30, 2014             14,032                        
Stockholders' equity attributable to parent, ending balance at Sep. 30, 2014 33,096           $ 14           137,259           (104,177)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Stock-based compensation expense 284                       284            
Issuance of common stock upon exercise of stock option grants (in shares)             5                        
Issuance of common stock upon exercise of stock option grants 34           $ 0           34            
Net income (loss) (5,506)                                   (5,506)
Number of shares outstanding, ending balance (in shares) at Dec. 31, 2014             14,037                        
Stockholders' equity attributable to parent, ending balance at Dec. 31, 2014 27,908           $ 14           137,577           (109,683)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Stock-based compensation expense 4,051                       4,051            
Issuance of common stock in connection with initial public offering, including underwriter's over-allotment, net of offering costs and underwriter's discount (in shares)             1,389                        
Issuance of common stock in connection with initial public offering, including underwriter's over-allotment, net of offering costs and underwriter's discount 54,331           $ 1           54,330            
Issuance of common stock upon exercise of stock option grants (in shares)             211                        
Issuance of common stock upon exercise of stock option grants 1,482           $ 0           1,482            
Net income (loss) 2,571                                   2,571
Number of shares outstanding, ending balance (in shares) at Dec. 31, 2015             15,637                        
Stockholders' equity attributable to parent, ending balance at Dec. 31, 2015 $ 90,343           $ 15           $ 197,440           $ (107,112)