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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2017 |  | 44,938,133 |  |  |
Beginning balance at Dec. 31, 2017 | $ 131,387 | $ 45 | $ 492,802 | $ (34) | $ (361,426)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net proceeds from public offering of common stock | 100,870 | $ 6 | 100,864 |  |
Net proceeds from public offering of common stock (in shares) |  | 6,325,000 |  |  |
Issuance of common stock from the exercise of stock options and settlement of restricted stock units | 6,256 | $ 1 | 6,255 |  |
Issuance of common stock from the exercise of stock options and settlement of restricted stock units (in shares) |  | 1,214,460 |  |  |
Stock-based compensation expense | 11,666 |  | 11,666 |  |
Net income | 25,208 |  |  |  | 25,208
Other comprehensive income (loss), net of tax | 35 |  |  | 35 |
Ending balance (in shares) at Dec. 31, 2018 |  | 52,477,593 |  |  |
Ending balance at Dec. 31, 2018 | 275,422 | $ 52 | 611,587 | 1 | (336,218)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock from the exercise of stock options and settlement of restricted stock units | 6,264 | $ 2 | 6,262 |  |
Issuance of common stock from the exercise of stock options and settlement of restricted stock units (in shares) |  | 1,072,019 |  |  |
Stock-based compensation expense | 13,458 |  | 13,458 |  |
Net income | 115,553 |  |  |  | 115,553
Other comprehensive income (loss), net of tax | $ 248 |  |  | 248 |
Ending balance (in shares) at Dec. 31, 2019 | 53,549,612 | 53,549,612 |  |  |
Ending balance at Dec. 31, 2019 | $ 410,945 | $ 54 | 631,307 | 249 | (220,665)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock from the exercise of stock options and settlement of restricted stock units | 5,634 | $ 1 | 5,633 |  |
Issuance of common stock from the exercise of stock options and settlement of restricted stock units (in shares) |  | 1,315,480 |  |  |
Stock-based compensation expense | 13,360 |  | 13,360 |  |
Net income | 23,337 |  |  |  | 23,337
Other comprehensive income (loss), net of tax | $ (10) |  |  | (10) |
Ending balance (in shares) at Dec. 31, 2020 | 54,865,092 | 54,865,092 |  |  |
Ending balance at Dec. 31, 2020 | $ 453,266 | $ 55 | $ 650,300 | $ 239 | $ (197,328)

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