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Quarterly financial summary (Tables) | 12 Months Ended
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Mar. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Quarterly financial summary | Unaudited quarterly results for the years ended March 31, 2020, December 31, 2018, and the transition period for the three months ended March 31, 2019 were as follows (in thousands, except per share data):
| March 31, 2018 |  | June 30, 2018 |  | September 30, 2018 |  | December 31, 2018 |  | March 31, 2019 (transition period) |  | June 30, 2019 |  | September 30, 2019 |  | December 31, 2019 |  | March 31, 2020
| (unaudited) |  |  |  |  |  | (unaudited) |  |
Net sales | $ | 65,920 |  |  | $ | 59,055 |  |  | $ | 63,889 |  |  | $ | 78,571 |  |  | $ | 66,141 |  |  | $ | 59,764 |  |  | $ | 67,615 |  |  | $ | 80,760 |  |  | $ | 74,712 |
Gross profit | $ | 40,208 |  |  | $ | 36,645 |  |  | $ | 38,969 |  |  | $ | 46,919 |  |  | $ | 40,491 |  |  | $ | 37,191 |  |  | $ | 43,348 |  |  | $ | 52,520 |  |  | $ | 48,064 |
Net income (loss) | $ | 690 |  |  | $ | 1,248 |  |  | $ | 3,915 |  |  | $ | 9,672 |  |  | $ | (17,914 | ) |  | $ | 3,706 |  |  | $ | 6,517 |  |  | $ | 8,002 |  |  | $ | (341 | )
Net income (loss) per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 0.01 |  |  | $ | 0.03 |  |  | $ | 0.08 |  |  | $ | 0.20 |  |  | $ | (0.37 | ) |  | $ | 0.08 |  |  | $ | 0.13 |  |  | $ | 0.16 |  |  | $ | (0.01 | )
Diluted | $ | 0.01 |  |  | $ | 0.03 |  |  | $ | 0.08 |  |  | $ | 0.20 |  |  | $ | (0.37 | ) |  | $ | 0.07 |  |  | $ | 0.13 |  |  | $ | 0.16 |  |  | $ | (0.01 | )

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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=118952077&loc=d3e1280-108306 + Details
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