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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Total
--- | --- | --- | --- | ---
Beginning balance, shares at Dec. 31, 2018 | 14,394,113 |  |  |
Beginning balance, amount at Dec. 31, 2018 | $ 14 | $ 61,153 | $ (59,167) | $ 2,000
Share-based compensation |  | 91 |  | 91
Vesting of restricted stock units | 2,494 |  |  |
Net income |  |  | 239 | 239
Ending balance, shares at Mar. 31, 2019 | 14,396,607 |  |  |
Ending balance, amount at Mar. 31, 2019 | $ 14 | 61,244 | (58,928) | 2,330
Beginning balance, shares at Dec. 31, 2018 | 14,394,113 |  |  |
Beginning balance, amount at Dec. 31, 2018 | $ 14 | 61,153 | (59,167) | 2,000
Net income |  |  |  | 577
Ending balance, shares at Jun. 30, 2019 | 14,581,484 |  |  |
Ending balance, amount at Jun. 30, 2019 | $ 15 | 61,610 | (58,590) | 3,035
Beginning balance, shares at Mar. 31, 2019 | 14,396,607 |  |  |
Beginning balance, amount at Mar. 31, 2019 | $ 14 | 61,244 | (58,928) | 2,330
Share-based compensation |  | 95 |  | 95
Vesting of restricted stock units | 7,498 |  |  |
Issuance of common stock for exercise of stock option, shares | 177,379 |  |  |
Issuance of common stock for exercise of stock option, amount | $ 1 | 271 |  | 272
Net income |  |  | 338 | 338
Ending balance, shares at Jun. 30, 2019 | 14,581,484 |  |  |
Ending balance, amount at Jun. 30, 2019 | $ 15 | 61,610 | (58,590) | 3,035
Beginning balance, shares at Dec. 31, 2019 | 14,884,755 |  |  |
Beginning balance, amount at Dec. 31, 2019 | $ 15 | 62,400 | (58,028) | 4,387
Share-based compensation |  | 105 |  | 105
Vesting of restricted stock units | 7,498 |  |  |
Issuance of common stock for exercise of stock option, shares | 49,200 |  |  |
Issuance of common stock for exercise of stock option, amount |  | 84 |  | 84
Net income |  |  | 140 | 140
Ending balance, shares at Mar. 31, 2020 | 14,941,453 |  |  |
Ending balance, amount at Mar. 31, 2020 | $ 15 | 62,589 | (57,888) | 4,716
Beginning balance, shares at Dec. 31, 2019 | 14,884,755 |  |  |
Beginning balance, amount at Dec. 31, 2019 | $ 15 | 62,400 | (58,028) | 4,387
Net income |  |  |  | 648
Ending balance, shares at Jun. 30, 2020 | 15,100,264 |  |  |
Ending balance, amount at Jun. 30, 2020 | $ 15 | 63,139 | (57,380) | 5,774
Beginning balance, shares at Mar. 31, 2020 | 14,941,453 |  |  |
Beginning balance, amount at Mar. 31, 2020 | $ 15 | 62,589 | (57,888) | 4,716
Share-based compensation |  | 136 |  | 136
Vesting of restricted stock units | 15,363 |  |  |
Issuance of common stock for exercise of stock option, shares | 143,448 |  |  |
Issuance of common stock for exercise of stock option, amount |  | 414 |  | 414
Net income |  |  | 508 | 508
Ending balance, shares at Jun. 30, 2020 | 15,100,264 |  |  |
Ending balance, amount at Jun. 30, 2020 | $ 15 | $ 63,139 | $ (57,380) | $ 5,774

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