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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock at Par Value | Additional Paid-In Capital | Accumulated Deficit
--- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 28, 2014 |  | 56,182 |  |
Beginning balance at Dec. 28, 2014 | $ 35,567 | $ 56 | $ 238,419 | $ (202,908)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Common stock issued under stock plans and employee stock purchase plans (in shares) |  | 722 |  |
Common stock issued under stock plans and employee stock purchase plans | 554 | $ 1 | 553 |
Stock-based compensation | 2,052 |  | 2,052 |
Net loss | (17,848) |  |  | (17,848)
Ending balance (in shares) at Jan. 03, 2016 |  | 56,904 |  |
Ending balance at Jan. 03, 2016 | 20,325 | $ 57 | 241,024 | (220,756)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Common stock issued under stock plans and employee stock purchase plans (in shares) |  | 1,230 |  |
Common stock issued under stock plans and employee stock purchase plans | 424 | $ 1 | 423 |
Private stock offering, net of issuance costs (in shares) |  | 10,000 |  |
Adjustment of Common stock and Warrants issuance costs | 8,803 | $ 10 | 8,793 |
Stock-based compensation | 1,584 |  | 1,584 |
Net loss | (19,148) |  |  | (19,148)
Ending balance (in shares) at Jan. 01, 2017 |  | 68,134 |  |
Ending balance at Jan. 01, 2017 | 11,988 | $ 68 | 251,824 | (239,904)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Common stock issued under stock plans and employee stock purchase plans (in shares) |  | 1,069 |  |
Common stock issued under stock plans and employee stock purchase plans | 351 | $ 1 | 350 |
Private stock offering, net of issuance costs (in shares) |  | 11,333 |  |
Adjustment of Common stock and Warrants issuance costs | 15,229 | $ 11 | 15,218 |
Stock-based compensation | 1,441 |  | 1,441 |
Net loss | (14,131) |  |  | (14,131)
Ending balance (in shares) at Dec. 31, 2017 |  | 80,536 |  |
Ending balance at Dec. 31, 2017 | $ 14,878 | $ 80 | $ 268,833 | $ (254,035)

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