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Quarterly Results of Operations (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Schedule of quarterly financial data | The following table presents selected unaudited quarterly financial data for each full quarterly period of 2020 and 2019:
(in thousands) |  | Mar. 30, 2019 |  | Jun. 29, 2019 |  | Sep. 28, 2019 |  | Dec. 31, 2019 |  | Mar. 30, 2020 |  | Jun. 27, 2020 |  | Sep. 26, 2020 |  | Dec. 31, 2020
Net revenues |  | $ | 40,206 |  |  | $ | 67,251 |  |  | $ | 91,961 |  |  | $ | 98,479 |  |  | $ | 97,074 |  |  | $ | 113,338 |  |  | $ | 94,436 |  |  | $ | 101,937 |
Cost of goods sold |  | 29,435 |  |  | 44,510 |  |  | 59,178 |  |  | 65,018 |  |  | 59,383 |  |  | 79,687 |  |  | 68,908 |  |  | 76,532 |
Gross profit |  | 10,771 |  |  | 22,741 |  |  | 32,783 |  |  | 33,461 |  |  | 37,691 |  |  | 33,651 |  |  | 25,528 |  |  | 25,405 |
Gross margin |  | 26.8 | % |  | 33.8 | % |  | 35.6 | % |  | 34.0 | % |  | 38.8 | % |  | 29.7 | % |  | 27.0 | % |  | 24.9 | %
Research and development expenses |  | 4,498 |  |  | 4,212 |  |  | 5,951 |  |  | 5,989 |  |  | 6,194 |  |  | 6,016 |  |  | 8,278 |  |  | 11,047 |
Selling, general and administrative expenses |  | 11,177 |  |  | 15,515 |  |  | 20,944 |  |  | 27,090 |  |  | 27,315 |  |  | 34,292 |  |  | 33,560 |  |  | 38,488 |
Restructuring expenses |  | 394 |  |  | 847 |  |  | 2,319 |  |  | 1,309 |  |  | 2,373 |  |  | 1,509 |  |  | 2,146 |  |  | 402 |
Total operating expenses |  | 16,069 |  |  | 20,574 |  |  | 29,214 |  |  | 34,388 |  |  | 35,882 |  |  | 41,817 |  |  | 43,984 |  |  | 49,937 |
(Loss) income from operations |  | (5,298) |  |  | 2,167 |  |  | 3,569 |  |  | (927) |  |  | 1,809 |  |  | (8,166) |  |  | (18,456) |  |  | (24,532) |
Other (expense) income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  | (733) |  |  | (741) |  |  | (855) |  |  | (742) |  |  | (705) |  |  | (569) |  |  | (689) |  |  | (613) |
Remeasurement of warrant liability |  | (759) |  |  | (11,744) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Other, net |  | 141 |  |  | 898 |  |  | 1,385 |  |  | 1,205 |  |  | 710 |  |  | (1,454) |  |  | (85) |  |  | 70 |
Total other (expense) income, net |  | (1,351) |  |  | (11,587) |  |  | 530 |  |  | 463 |  |  | 5 |  |  | (2,023) |  |  | (774) |  |  | (543) |
(Loss) income before taxes |  | (6,649) |  |  | (9,420) |  |  | 4,099 |  |  | (464) |  |  | 1,814 |  |  | (10,189) |  |  | (19,230) |  |  | (25,075) |
Income tax expense (benefit) |  | — |  |  | 21 |  |  | — |  |  | (12) |  |  | (1) |  |  | 16 |  |  | 55 |  |  | 2 |
Net (loss) income |  | $ | (6,649) |  |  | $ | (9,441) |  |  | $ | 4,099 |  |  | $ | (452) |  |  | $ | 1,815 |  |  | $ | (10,205) |  |  | $ | (19,285) |  |  | $ | (25,077) |
Net (loss) income per share available to common stockholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | (0.95) |  |  | $ | (0.24) |  |  | $ | 0.07 |  |  | $ | (0.01) |  |  | $ | 0.03 |  |  | $ | (0.16) |  |  | $ | (0.31) |  |  | $ | (0.40) |
Diluted |  | $ | (0.95) |  |  | $ | (0.24) |  |  | $ | 0.06 |  |  | $ | (0.01) |  |  | $ | 0.03 |  |  | $ | (0.16) |  |  | $ | (0.31) |  |  | $ | (0.40) |
______________ (1)The sum of quarterly amounts, including per share amounts, may not equal amounts reported for year-to-date periods. This is due to the effects of rounding and changes in the number of weighted-average shares outstanding for each period.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121640914&loc=d3e1280-108306 + Details
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