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SHAREHOLDERS' DEFICIT - USD ($)
$ in Thousands
Common stock
Additional Paid-In Capital
Treasury Stock, at cost
Accumulated Deficit
Total
Balance at beginning of year at Dec. 31, 2012 $ 2 $ 11 $ (3) $ (61,414) $ (61,404)
Balance at beginning of year (in shares) at Dec. 31, 2012 1,924,845        
Increase (decrease) in stockholders' equity (deficit)          
Accruals of dividends and accretion to redemption value   (1)   (2,925) (2,926)
Performance Adjustment of Series A $ (1) 12,240     12,239
Performance Adjustment of Series A (in shares) (962,962)        
Stock-based compensation expense   62     62
Exercise of common stock options   1     1
Exercise of common stock options (in shares) 1,077        
Net loss       (16,197) (16,197)
Balance at end of year at Dec. 31, 2013 $ 1 12,313 (3) (80,536) (68,225)
Balance at end of year (in shares) at Dec. 31, 2013 962,960        
Increase (decrease) in stockholders' equity (deficit)          
Accruals of dividends and accretion to redemption value       (3,300) (3,300)
Issuance of restricted stock awards to employees (in shares) 10,869        
Stock-based compensation expense   22     22
Exercise of common stock options   72     72
Exercise of common stock options (in shares) 32,390        
Net loss       (17,917) (14,448)
Balance at end of year at Dec. 31, 2014 $ 1 $ 12,407 $ (3) $ (101,753) $ (89,348)
Balance at end of year (in shares) at Dec. 31, 2014 1,006,219        
Increase (decrease) in stockholders' equity (deficit)          
Exercise of common stock options (in shares)         121,729
Net loss         $ (17,730)
Balance at end of year at Sep. 30, 2015         $ 93,561