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Condensed Consolidated Statement of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member]
--- | --- | --- | --- | ---
Balance at Dec. 31, 2018 | $ 268,491 | $ 13 | $ 177,683 | $ 90,795
Balance, shares at Dec. 31, 2018 |  | 13,126 |  |
Issuance of shares of common stock under restricted stock award agreements, shares |  | 64 |  |
Forfeiture of shares of common stock under restricted stock award agreements, shares |  | (4) |  |
Stock-based compensation | 4,186 |  | 4,186 |
Shares issued for exercise of stock options | 2,077 |  | 2,077 |
Shares issued for exercise of stock options, shares |  | 73 |  |
Shares issued in Public Offering, net of offering costs | 172,945 | $ 2 | 172,943 |
Shares issued in public offering, net of offering costs, shares |  | 2,300 |  |
Net income | 14,500 |  |  | 14,500
Balance at Sep. 30, 2019 | 462,199 | $ 15 | 356,889 | 105,295
Balance, shares at Sep. 30, 2019 |  | 15,559 |  |
Balance at Jun. 30, 2019 | 281,507 | $ 13 | 181,111 | 100,383
Balance, shares at Jun. 30, 2019 |  | 13,219 |  |
Issuance of shares of common stock under restricted stock award agreements, shares |  | 1 |  |
Forfeiture of shares of common stock under restricted stock award agreements, shares |  | (4) |  |
Stock-based compensation | 1,470 |  | 1,470 |
Shares issued for exercise of stock options | 1,365 |  | 1,365 |
Shares issued for exercise of stock options, shares |  | 43 |  |
Shares issued in Public Offering, net of offering costs | 172,945 | $ 2 | 172,943 |
Shares issued in public offering, net of offering costs, shares |  | 2,300 |  |
Net income | 4,912 |  |  | 4,912
Balance at Sep. 30, 2019 | 462,199 | $ 15 | 356,889 | 105,295
Balance, shares at Sep. 30, 2019 |  | 15,559 |  |
Balance at Dec. 31, 2019 | 475,592 | $ 15 | 359,545 | 116,032
Balance, shares at Dec. 31, 2019 |  | 15,617 |  |
Issuance of shares of common stock under restricted stock award agreements, shares |  | 81 |  |
Forfeiture of shares of common stock under restricted stock award agreements, shares |  | (6) |  |
Stock-based compensation | 3,987 |  | 3,987 |
Shares issued for exercise of stock options | 3,337 | $ 1 | 3,336 |
Shares issued for exercise of stock options, shares |  | 109 |  |
Net income | 24,684 |  |  | 24,684
Balance at Sep. 30, 2020 | 507,600 | $ 16 | 366,868 | 140,716
Balance, shares at Sep. 30, 2020 |  | 15,801 |  |
Balance at Jun. 30, 2020 | 494,861 | $ 16 | 363,248 | 131,597
Balance, shares at Jun. 30, 2020 |  | 15,665 |  |
Issuance of shares of common stock under restricted stock award agreements, shares |  | 81 |  |
Stock-based compensation | 1,462 |  | 1,462 |
Shares issued for exercise of stock options | 2,158 |  | 2,158 |
Shares issued for exercise of stock options, shares |  | 55 |  |
Net income | 9,119 |  |  | 9,119
Balance at Sep. 30, 2020 | $ 507,600 | $ 16 | $ 366,868 | $ 140,716
Balance, shares at Sep. 30, 2020 |  | 15,801 |  |

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