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Significant Accounting Policies (Details) - USD ($) $ / shares in Units, shares in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2021 | Mar. 11, 2020 | Nov. 06, 2017
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized for repurchase |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 75,000,000 |
Shares repurchased during the period (shares) |  |  |  |  |  |  |  |  | 760 |  |  |  |  |  |
Weighted average share price of shares repurchased (per share) |  |  |  |  |  |  |  |  | $ 25.40 |  |  |  |  |  |
Common stock repurchases | [1] |  |  |  |  |  |  |  |  |  | $ 19,300,000 |  |  |  |
Sales |  | $ 378,900,000 | $ 328,300,000 | $ 322,000,000.0 | $ 288,500,000 | $ 312,400,000 | $ 273,200,000 | $ 289,600,000 | $ 301,900,000 | $ 1,317,700,000 | 1,177,100,000 | $ 1,215,500,000 |  |  |
Cost of sales |  |  |  |  |  |  |  |  |  | 993,500,000 | 845,000,000.0 | 918,000,000.0 |  |  |
Advertising costs |  |  |  |  |  |  |  |  |  | 3,900,000 | 2,700,000 | 4,000,000.0 |  |  |
Research and development expense |  |  |  |  |  |  |  |  |  | 12,700,000 | 9,100,000 | 9,200,000 |  |  |
(Loss) income from continuing operations |  | $ 12,100,000 | $ 14,900,000 | $ 6,500,000 | $ 25,600,000 | $ 37,500,000 | $ 15,600,000 | $ 13,800,000 | $ 2,000,000.0 | $ 59,100,000 | $ 68,900,000 | $ 31,400,000 |  |  |
Income (loss) from continuing operations, basic (usd per share) |  | $ 0.34 | $ 0.42 | $ 0.18 | $ 0.72 | $ 1.06 | $ 0.44 | $ 0.39 | $ 0.06 | $ 1.66 | $ 1.95 | $ 0.93 |  |  |
Income (loss) from continuing operations, diluted (usd per share) |  | $ 0.29 | $ 0.36 | $ 0.16 | $ 0.63 | $ 0.97 | $ 0.43 | $ 0.39 | $ 0.06 | $ 1.44 | $ 1.89 | $ 0.89 |  |  |
Scenario, Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense excluding amortization |  |  |  |  |  |  |  |  |  | $ 8,400,000 |  |  |  |  |
(Loss) income from continuing operations |  |  |  |  |  |  |  |  |  | $ 52,600,000 |  |  |  |  |
Income (loss) from continuing operations, basic (usd per share) |  |  |  |  |  |  |  |  |  | $ 0.18 |  |  |  |  |
Income (loss) from continuing operations, diluted (usd per share) |  |  |  |  |  |  |  |  |  | $ 0.16 |  |  |  |  |
Convertible Notes, due 2024 | Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 258,800,000 |  |  |  | $ 258,800,000 |  |  |  | $ 258,800,000 | $ 258,800,000 |  |  |  | $ 258,800,000
Interest expense excluding amortization |  |  |  |  |  |  |  |  |  | 2,600,000 | 2,600,000 | $ 2,600,000 |  |  |
Unamortized discount |  | 0 |  |  |  | (34,800,000) |  |  |  | 0 | (34,800,000) |  | $ (3,900,000) |  |
Unamortized debt issuance costs |  | $ 2,900,000 |  |  |  | $ 3,100,000 |  |  |  | 2,900,000 | 3,100,000 |  |  |  |
Shipping |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  | 11,800,000 | 10,600,000 | 11,300,000 |  |  |
Cost of sales |  |  |  |  |  |  |  |  |  | $ 17,600,000 | $ 15,000,000.0 | $ 15,800,000 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible asset useful life |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible asset useful life |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |
[1] | Includes $19.3 in shares repurchased through our share repurchase program. Refer to Note 2, “Significant Accounting Policies,” for further information.

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