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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)
$ in Thousands
Total
Common Stock
Treasury Stock
Additional Paid-in Capital
Retained Earnings (Accumulated Deficit)
Beginning balance at Dec. 31, 2014 $ (1,957) $ 22 $ (2) $ 3,329 $ (5,306)
Beginning balance, shares at Dec. 31, 2014   22,039,380 220    
Vesting of restricted stock, shares   99,880      
Stock-based compensation 817     817  
Restricted stock buy back (121)   $ (121)    
Restricted stock buy back, shares   (24,640) 24,640    
Net income 4,990       4,990
Ending balance at Dec. 31, 2015 3,729 $ 22 $ (123) 4,146 (316)
Ending balance, shares at Dec. 31, 2015   22,114,620 24,860    
Vesting of restricted stock, shares   167,090      
Proceeds from equity issuance, net of transaction costs 127,302 $ 13   127,289  
Proceeds from equity issuance, net of transaction costs, shares   12,577,500      
Exercise of warrants 22 $ 4   18  
Exercise of warrants, shares   3,999,998      
Stock-based compensation 1,426     1,426  
Restricted stock buy back (416)   $ (416)    
Restricted stock buy back, shares   (42,734) 42,734    
Net income 10,379       10,379
Ending balance at Dec. 31, 2016 142,442 $ 39 $ (539) 132,879 10,063
Ending balance, shares at Dec. 31, 2016   38,816,474 67,594    
Vesting of restricted stock, shares   90,017      
Employee stock purchase plan compensation 39     39  
Proceeds from equity issuance, net of transaction costs 24,169 $ 1   24,168  
Proceeds from equity issuance, net of transaction costs, shares   1,500,000      
Stock-based compensation 1,973     1,973  
Restricted stock buy back (127)   $ (127)    
Restricted stock buy back, shares   (13,458) 13,458    
Net income 21,526       21,526
Ending balance at Dec. 31, 2017 $ 190,022 $ 40 $ (666) $ 159,059 $ 31,589
Ending balance, shares at Dec. 31, 2017   40,393,033 81,052