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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. 31, 2017 | 14,878 | $ 80 | 268,833 | (254,035)
Beginning balance (in shares) at Dec. 31, 2017 |  | 80,536 |  |
Net loss | (10,714) |  |  |
Ending balance at Sep. 30, 2018 | 19,551 | $ 95 | 284,205 | (264,749)
Ending balance (in shares) at Sep. 30, 2018 |  | 94,922 |  |
Beginning balance at Apr. 01, 2018 | 11,293 | $ 80 | 269,218 | (258,005)
Beginning balance (in shares) at Apr. 01, 2018 |  | 80,627 |  |
Common stock issued under stock plans and employee stock purchase plan | 233 |  | 233 |
Common Stock issued under stock plans and employee stock purchase plan, shares |  | 434 |  |
Common stock offering, net of issuance costs | 13,903 | $ 14 | 13,889 |
Common stock offering, net of issuance costs (in shares) |  | 13,514 |  |
Stock-based compensation | 479 |  | 479 |
Net loss | (3,484) |  |  | (3,484)
Ending balance at Jul. 01, 2018 | 22,424 | $ 94 | 283,819 | (261,489)
Ending balance (in shares) at Jul. 01, 2018 |  | 94,575 |  |
Common stock issued under stock plans and employee stock purchase plan | (129) | $ 1 | (130) |
Common Stock issued under stock plans and employee stock purchase plan, shares |  | 347 |  |
Stock-based compensation | 516 |  | 516 |
Net loss | (3,260) |  |  | (3,260)
Ending balance at Sep. 30, 2018 | 19,551 | $ 95 | 284,205 | (264,749)
Ending balance (in shares) at Sep. 30, 2018 |  | 94,922 |  |
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 |  |
Beginning balance at Dec. 30, 2018 | 17,255 | $ 95 | 284,974 | (267,814)
Beginning balance (in shares) at Dec. 30, 2018 |  | 95,513 |  |
Net loss | (12,381) |  |  |
Ending balance at Sep. 29, 2019 | 16,238 | $ 116 | 296,317 | (280,195)
Ending balance (in shares) at Sep. 29, 2019 |  | 116,556 |  |
Beginning balance at Mar. 31, 2019 | 15,470 | $ 97 | 286,663 | (271,290)
Beginning balance (in shares) at Mar. 31, 2019 |  | 97,189 |  |
Common stock issued under stock plans and employee stock purchase plan | 210 | $ 1 | 209 |
Common Stock issued under stock plans and employee stock purchase plan, shares |  | 532 |  |
Common stock offering, net of issuance costs | 8,025 | $ 18 | 8,007 |
Common stock offering, net of issuance costs (in shares) |  | 18,400 |  |
Stock-based compensation | 791 |  | 791 |
Net loss | (4,634) |  |  | (4,634)
Ending balance at Jun. 30, 2019 | 19,862 | $ 116 | 295,670 | (275,924)
Ending balance (in shares) at Jun. 30, 2019 |  | 116,121 |  |
Common stock issued under stock plans and employee stock purchase plan | (94) |  | (94) |
Common Stock issued under stock plans and employee stock purchase plan, shares |  | 435 |  |
Common stock offering, net of issuance costs | (6) |  | (6) |
Stock-based compensation | 747 |  | 747 |
Net loss | (4,271) |  |  | (4,271)
Ending balance at Sep. 29, 2019 | $ 16,238 | $ 116 | $ 296,317 | $ (280,195)
Ending balance (in shares) at Sep. 29, 2019 |  | 116,556 |  |

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