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Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Results of Operations (Unaudited) |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 257,922 | $ 243,049 | $ 255,532 | $ 238,349 | $ 233,249 | $ 221,659 | $ 224,810 | $ 203,035 | $ 994,852 | $ 882,753 | $ 727,852
Gross profit | 111,630 | 104,136 | 111,964 | 104,636 | 104,666 | 102,039 | 100,009 | 88,056 | 432,366 | 394,770 | 326,253
Income (loss) from operations | (3,409) | (2,881) | 12,201 | 9,523 | 13,661 | 21,061 | 15,114 | 8,781 | 15,434 | 58,617 | 33,069
Income tax expense (benefit) | (3,757) | (2,292) | 2,140 | 651 | 3,022 | 2,766 | 624 | 1,090 | (3,258) | 7,502 | 8,358
Net income (loss) | $ (4,205) | $ (3,398) | $ 6,859 | $ 6,195 | $ 9,188 | $ 16,619 | $ 10,941 | $ 5,269 | $ 5,451 | $ 42,017 | $ 27,523
Basic (in dollars per share) | $ (0.08) | $ (0.06) | $ 0.12 | $ 0.11 | $ 0.17 | $ 0.31 | $ 0.22 | $ 0.10 | $ 0.10 | $ 0.80 | $ 0.56
Diluted (in dollars per share) | $ (0.08) | $ (0.06) | $ 0.12 | $ 0.11 | $ 0.16 | $ 0.30 | $ 0.21 | $ 0.10 | $ 0.10 | $ 0.78 | $ 0.55
Impairment and other charges |  |  |  |  |  |  |  |  | $ 23,750 | $ 657 | $ 809
NinePoint Medical, Inc. |  |  |  |  |  |  |  |  |  |  |
Quarterly Results of Operations (Unaudited) |  |  |  |  |  |  |  |  |  |  |
Impairment and other charges | $ 20,500 |  |  |  |  |  |  |  | 20,500 |  |
Write off of accrued interest | $ (1,600) |  |  |  |  |  |  |  | $ (1,600) |  |

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