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Stockholders' Equity and Stock-Based Compensation - Summary of Stock Options (Details)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 29, 2019
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]  
Outstanding, Number of Shares, Beginning Balance | shares 844,898
Number of Shares, Options Granted | shares 731,700
Number of Shares, Options Exercised | shares (210)
Number of Shares, Options Cancelled or forfeited | shares (170,911)
Outstanding, Number of Shares, Ending Balance | shares 1,405,477
Outstanding, Weighted Average Exercise Price Per Share, Beginning Balance | $ / shares $ 8.84
Weighted Average Exercise Price Per Share, Options Granted | $ / shares 4.90
Weighted Average Exercise Price Per Share, Options Exercised | $ / shares 3.49
Weighted Average Exercise Price Per Share, Options Cancelled or forfeited | $ / shares 9.68
Outstanding, Weighted Average Exercise Price Per Share, Ending Balance | $ / shares $ 6.68
Aggregate Intrinsic Value, Ending Balance | $ $ 21