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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Retained Earnings
--- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 | $ 14,878 | $ 80 | $ 268,833 | $ (254,035)
Beginning balance (in shares) at Dec. 31, 2017 |  | 80,536 |  |
Common Stock issued under stock plans and employee stock purchase plan | (47) |  | (47) |
Common Stock issued under stock plans and employee stock purchase plan, shares |  | 91 |  |
Stock-based compensation | 432 |  | 432 |
Net loss | (3,970) |  |  | (3,970)
Ending balance at Apr. 01, 2018 | 11,293 | $ 80 | 269,218 | (258,005)
Ending balance (in shares) at Apr. 01, 2018 |  | 80,627 |  |
Beginning balance at Dec. 30, 2018 | 17,255 | $ 95 | 284,974 | (267,814)
Beginning balance (in shares) at Dec. 30, 2018 |  | 95,513 |  |
Common Stock issued under stock plans and employee stock purchase plan | 740 | $ 2 | 738 |
Common Stock issued under stock plans and employee stock purchase plan, shares |  | 1,676 |  |
Stock-based compensation | 951 |  | 951 |
Net loss | (3,476) |  |  | (3,476)
Ending balance at Mar. 31, 2019 | $ 15,470 | $ 97 | $ 286,663 | $ (271,290)
Ending balance (in shares) at Mar. 31, 2019 |  | 97,189 |  |

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