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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | Total
--- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2018 | $ 389 | $ 297,319 | $ (150,726) | $ 146,982
Increase (Decrease) in Stockholders' Equity |  |  |  |
Net Loss |  |  | (9,504) | (9,504)
Stock-based compensation |  | 2,315 |  | 2,315
Exercise of stock options | 2 | 948 |  | 950
Ending Balance at Mar. 31, 2019 | 391 | 300,582 | (160,230) | 140,743
Beginning Balance at Dec. 31, 2019 | 396 | 311,618 | (179,861) | $ 132,153
Beginning Balance (in shares) at Dec. 31, 2019 |  |  |  | 39,589,755
Increase (Decrease) in Stockholders' Equity |  |  |  |
Net Loss |  |  | (8,192) | $ (8,192)
Issuance of restricted and performance stock units | 1 | (1) |  |
Stock-based compensation |  | 556 |  | 556
Shares surrendered by employees to pay tax withholdings |  | 639 |  | 639
Exercise of stock options |  | 316 |  | 316
Ending Balance at Mar. 31, 2020 | $ 397 | $ 311,850 | $ (188,053) | $ 124,194
Ending Balance (in shares) at Mar. 31, 2020 |  |  |  | 39,738,767

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