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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Balance at Dec. 29, 2017 $ 42,936 $ 414 $ 204,920 $ (1,150) $ (161,248)
Balance (in shares) at Dec. 29, 2017   41,383      
Net income 3,872       3,872
Other comprehensive loss (51)     (51)  
Proceeds from public stock offering 72,150 $ 20 72,130    
Proceeds from public offering of stock (in shares)   2,000      
Common stock issued upon exercise of options 4,580 $ 5 4,575    
Common stock issued upon exercise of options (in shares)   525      
Stock-based compensation $ 5,375   5,375    
Unvested restricted stock (in shares) (11) 11      
Vested restricted stock $ 2 $ 2      
Vested restricted stock (in shares)   185      
Balance at Sep. 28, 2018 128,864 $ 441 287,000 (1,201) (157,376)
Balance (in shares) at Sep. 28, 2018   44,104      
Balance at Jun. 29, 2018 51,083 $ 419 210,488 (989) (158,835)
Balance (in shares) at Jun. 29, 2018   41,877      
Net income 1,459       1,459
Other comprehensive loss (212)     (212)  
Proceeds from public stock offering 72,150 $ 20 72,130    
Proceeds from public offering of stock (in shares)   2,000      
Common stock issued upon exercise of options 2,175 $ 2 2,173    
Common stock issued upon exercise of options (in shares)   219      
Stock-based compensation $ 2,209   2,209    
Unvested restricted stock (in shares) (11)        
Vested restricted stock (in shares)   8      
Balance at Sep. 28, 2018 $ 128,864 $ 441 287,000 (1,201) (157,376)
Balance (in shares) at Sep. 28, 2018   44,104      
Balance at Dec. 28, 2018 132,426 $ 442 289,584 (1,320) (156,280)
Balance (in shares) at Dec. 28, 2018   44,195      
Net income 7,669       7,669
Adoption of ASC/ ASU | Accounting Standards Update 2016-02 113       113
Adoption of ASC/ ASU | Accounting Standards Update 2018-07     (315)   315
Other comprehensive loss (1,200)     (1,200)  
Common stock issued upon exercise of options $ 1,829 $ 2 1,827    
Common stock issued upon exercise of options (in shares) 190 190      
Stock-based compensation $ 8,501   8,501    
Unvested restricted stock (in shares) (10) 11      
Vested restricted stock $ 2 $ 2      
Vested restricted stock (in shares)   210      
Balance at Sep. 27, 2019 149,340 $ 446 299,597 (2,520) (148,183)
Balance (in shares) at Sep. 27, 2019   44,606      
Balance at Jun. 28, 2019 144,335 $ 445 296,063 (1,602) (150,571)
Balance (in shares) at Jun. 28, 2019   44,534      
Net income 2,388       2,388
Other comprehensive loss (918)     (918)  
Common stock issued upon exercise of options 719 $ 1 718    
Common stock issued upon exercise of options (in shares)   64      
Stock-based compensation $ 2,816   2,816    
Unvested restricted stock (in shares) (10)        
Vested restricted stock (in shares)   8      
Balance at Sep. 27, 2019 $ 149,340 $ 446 $ 299,597 $ (2,520) $ (148,183)
Balance (in shares) at Sep. 27, 2019   44,606