Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity and Share-Based Compensation - Summary of Stock Option Activity for AutoMD (Details)

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Stockholders' Equity and Share-Based Compensation - Summary of Stock Option Activity for AutoMD (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Shares    
Outstanding, beginning (in shares) 5,841 5,281
Granted (in shares) 1,000 1,315
Exercised (in shares) (442) (301)
Cancelled:    
Forfeited (in shares) (149) (256)
Expired (in shares) (122) (198)
Outstanding, ending (in shares) 6,128 5,841
Vested and expected to vest (in shares) 5,658 5,285
Exercisable (in shares) 4,220 3,735
Weighted Average Exercise Price    
Outstanding, beginning (in dollars per share) $ 2.80 $ 2.85
Granted (in dollars per share) 3.03 2.24
Exercised (in dollars per share) 2.06 1.45
Cancelled:    
Forfeited (in dollars per share) 2.47 2.06
Expired (in dollars per share) 7.66 3.31
Outstanding, ending (in dollars per share) 2.81 2.80
Vested and expected to vest (in dollars per share) 2.82 2.88
Exercisable (in dollars per share) $ 2.92 $ 3.21
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]    
Outstanding, weighted average contractual term 5 years 8 months 27 days 6 years 11 days
Vested and expected to vest, weighted average contractual term 5 years 5 months 27 days 5 years 8 months 27 days
Exercisable, weighted average contractual term 4 years 5 months 27 days 4 years 6 months 15 days
Outstanding, aggregate intrinsic value $ 6,561 $ 4,333
Vested and expected to vest, aggregate intrinsic value 6,111 3,853
Exercisable, aggregate intrinsic value $ 4,618 $ 2,479
Equity Incentive Plan 2014    
Shares    
Outstanding, beginning (in shares) 1,430 180
Granted (in shares) 10 1,250
Exercised (in shares) 0 0
Cancelled:    
Forfeited (in shares) (35) 0
Expired (in shares) 0 0
Outstanding, ending (in shares) 1,405 1,430
Vested and expected to vest (in shares) 1,044 1,061
Exercisable (in shares) 632 49
Weighted Average Exercise Price    
Outstanding, beginning (in dollars per share) $ 1.00 $ 1.00
Granted (in dollars per share) 1.00 1.00
Exercised (in dollars per share) 0.00 0.00
Cancelled:    
Forfeited (in dollars per share) 1.00 0.00
Expired (in dollars per share) 0.00 0.00
Outstanding, ending (in dollars per share) 1.00 1.00
Vested and expected to vest (in dollars per share) 1.00 1.00
Exercisable (in dollars per share) $ 1.00 $ 1.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]    
Outstanding, weighted average contractual term 8 years 2 months 12 days 9 years 2 months 7 days
Vested and expected to vest, weighted average contractual term 8 years 2 months 9 days 9 years 2 months 7 days
Exercisable, weighted average contractual term 8 years 1 month 21 days 8 years 11 months 1 day
Outstanding, aggregate intrinsic value $ 0
Vested and expected to vest, aggregate intrinsic value 0
Exercisable, aggregate intrinsic value $ 0