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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' DEFICIT - USD ($)
$ in Thousands
Total
Revision of Prior Period, Adjustment
Common Stock Issued
Additional Paid-in Capital
Additional Paid-in Capital
Revision of Prior Period, Adjustment
Treasury Stock
Treasury Stock
Revision of Prior Period, Adjustment
Accumulated Deficit
Balance beginning of period (in shares) at Dec. 31, 2019     112,703,926     1,885,277    
Balance, beginning of period at Dec. 31, 2019 $ 34,398   $ 113 $ 147,231   $ (10,806)   $ (102,140)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of Series B Convertible Preferred Stock 32,954     32,954        
Deemed dividends (31,568)     (31,568)        
Share-based compensation expense 11,829     11,829        
Exercise of stock options 370     (1,986)   $ 2,356    
Exercise of stock options (in shares)           (265,300)    
Issuance of restricted stock 0     (2,939)   $ 2,939    
Issuance of restricted stock (in shares)           (328,894)    
Restricted stock canceled/forfeited 0     2,650   $ (2,650)    
Restricted stock canceled/forfeited (in shares)           345,052    
Shares repurchased for tax withholding (in shares)           476,057    
Shares repurchased for tax withholding (2,409)     147   $ (2,556)    
Net loss (32,704)             (32,704)
Balance end of period (in shares) at Sep. 30, 2020     112,703,926     2,112,192    
Balance, end of period at Sep. 30, 2020 12,870   $ 113 158,318   $ (10,717)   (134,844)
Balance beginning of period (in shares) at Jun. 30, 2020     112,703,926     2,412,522    
Balance, beginning of period at Jun. 30, 2020 22,860   $ 113 151,625   $ (13,451)   (115,427)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of Series B Convertible Preferred Stock 32,954     32,954        
Deemed dividends (31,568)     (31,568)        
Share-based compensation expense 8,048     8,048        
Exercise of stock options 72     (328)   $ 400    
Exercise of stock options (in shares)           (45,000)    
Issuance of restricted stock 0     (2,939)   $ 2,939    
Issuance of restricted stock (in shares)           (328,894)    
Restricted stock canceled/forfeited 0     526   $ (526)    
Restricted stock canceled/forfeited (in shares)           59,441    
Shares repurchased for tax withholding (in shares)           14,123    
Shares repurchased for tax withholding (79)         $ (79)    
Net loss (19,417)             (19,417)
Balance end of period (in shares) at Sep. 30, 2020     112,703,926     2,112,192    
Balance, end of period at Sep. 30, 2020 $ 12,870   $ 113 158,318   $ (10,717)   (134,844)
Balance beginning of period (in shares) at Dec. 31, 2020 112,703,926   112,703,926     1,773,683    
Balance, beginning of period at Dec. 31, 2020 $ (150)   $ 113 158,610   $ (7,449)   (151,424)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Correction of out-of-period error (Note 1) | Stock Award Misstatements             $ 2,000  
Balance end of period (in shares) at Jun. 30, 2021     112,703,926     821,988    
Balance, end of period at Jun. 30, 2021 $ (7,137)   $ 113 158,720   $ (4,385)   (161,585)
Balance beginning of period (in shares) at Dec. 31, 2020 112,703,926   112,703,926     1,773,683    
Balance, beginning of period at Dec. 31, 2020 $ (150)   $ 113 158,610   $ (7,449)   (151,424)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Correction of out-of-period error (Note 1) | Stock Award Misstatements   $ 0     $ (2,009)   $ 2,009  
Correction of out-of-period error (Note 1) (in shares) | Stock Award Misstatements             (239,502)  
Deemed dividends (926)     (926)        
Share-based compensation expense 11,115     11,115        
Exercise of stock options $ 1,404     (1,184)   $ 2,588    
Exercise of stock options (in shares) (524,171)         (482,361)    
Issuance of restricted stock $ 0     (4,053)   $ 4,053    
Issuance of restricted stock (in shares)           (810,405)    
Restricted stock canceled/forfeited 0     450   $ (450)    
Restricted stock canceled/forfeited (in shares)           66,374    
Shares repurchased for tax withholding (in shares)           469,239    
Shares repurchased for tax withholding (4,751)         $ (4,751)    
Net loss $ (12,500)             (12,500)
Balance end of period (in shares) at Sep. 30, 2021 112,703,926   112,703,926     777,028    
Balance, end of period at Sep. 30, 2021 $ (5,808)   $ 113 162,003   $ (4,000)   (163,924)
Balance beginning of period (in shares) at Jun. 30, 2021     112,703,926     821,988    
Balance, beginning of period at Jun. 30, 2021 (7,137)   $ 113 158,720   $ (4,385)   (161,585)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Share-based compensation expense 3,811     3,811        
Exercise of stock options 45     (250)   $ 295    
Exercise of stock options (in shares)           (30,032)    
Issuance of restricted stock 0     (477)   $ 477    
Issuance of restricted stock (in shares)           (48,630)    
Restricted stock canceled/forfeited 0     199   $ (199)    
Restricted stock canceled/forfeited (in shares)           18,348    
Shares repurchased for tax withholding (in shares)           15,354    
Shares repurchased for tax withholding (188)         $ (188)    
Net loss $ (2,339)             (2,339)
Balance end of period (in shares) at Sep. 30, 2021 112,703,926   112,703,926     777,028    
Balance, end of period at Sep. 30, 2021 $ (5,808)   $ 113 $ 162,003   $ (4,000)   $ (163,924)