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Stockholders' Equity and Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Proceeds from issuance of common stock, net of issuance costs |  |  | $ 10,637 | $ 2,263
Weighted-average grant date fair value of the options granted | $ 2.47 | $ 3.55 | $ 2.34 | $ 3.75
Total intrinsic value of options exercised |  |  | $ 71 | $ 328
Total unrecognized compensation cost related to non-vested share-based compensation arrangements | $ 5,900 |  | $ 5,900 |
Cost is expected to be recognized over a weighted average period |  |  | 2 years 10 months 28 days |
Restricted Stock Units (RSUs) |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Unvested restricted stock awarded |  |  | 408,750 |
Weighted-average grant date fair value of restricted stock awarded |  |  | $ 7.86 |
Restricted Stock Units With Market Conditions |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Unvested restricted stock awarded |  |  | 72,870 |
Restricted Stock Awards |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Unvested restricted stock awarded |  |  | 165,330 |
Common Stock | Underwritten Public Offering |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Common stock, shares |  |  | 1,916,667 |
Common stock, price per share | $ 6.00 |  | $ 6.00 |
Proceeds from issuance of common stock, net of issuance costs |  |  | $ 10,600 |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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