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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 |  |

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