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Transition period (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2018
Income Statement [Abstract]                                
Net sales $ 92,671 $ 88,562 $ 72,350 $ 64,527 $ 74,712 $ 80,760 $ 67,615 $ 59,764 $ 66,141 $ 78,571 $ 63,889 $ 59,055 $ 65,920 $ 318,110 $ 282,851 $ 267,435
Cost of sales                 25,650       25,712 111,912 101,728 104,694
Gross profit 58,600 57,119 47,138 43,341 48,064 52,520 43,348 37,191 40,491 46,919 38,969 36,645 40,208 206,198 181,123 162,741
Selling, general, and administrative expenses                 37,324       36,234 194,157 157,155 136,579
Restructuring expense (income)                 22,176       0 2,641 (5,982) 0
Operating income (loss)                 (19,009)       3,974 9,400 29,950 26,162
Other expense, net                 (315)       (888) (1,620) 426 (390)
Interest expense, net                 (1,849)       (1,963) (4,090) (6,307) (7,816)
Income (loss) before provision for income taxes                 (21,173)       1,123 3,690 24,069 17,956
Income tax benefit (provision)                 3,259       (433) 2,542 (6,185) (2,431)
Net income (loss) $ (24) $ 4,297 $ 447 $ 1,512 $ (341) $ 8,002 $ 6,517 $ 3,706 (17,914) $ 9,672 $ 3,915 $ 1,248 690 6,232 17,884 15,525
Comprehensive income (loss)                 $ (17,914)       $ 690 $ 6,232 $ 17,884 $ 15,525
Basic (in USD per share) $ (0.00) $ 0.09 $ 0.01 $ 0.03 $ (0.01) $ 0.16 $ 0.13 $ 0.08 $ (0.37) $ 0.20 $ 0.08 $ 0.03 $ 0.01 $ 0.13 $ 0.37 $ 0.33
Diluted (in USD per share) $ (0.00) $ 0.08 $ 0.01 $ 0.03 $ (0.01) $ 0.16 $ 0.13 $ 0.07 $ (0.37) $ 0.20 $ 0.08 $ 0.03 $ 0.01 $ 0.12 $ 0.35 $ 0.32
Basic (in shares)                 48,022,926       46,435,560 49,377,410 48,498,813 46,828,798
Diluted (in shares)                 48,022,926       49,302,771 51,994,145 50,817,143 49,268,616
Cash flows from operating activities:                                
Net income (loss) $ (24) $ 4,297 $ 447 $ 1,512 $ (341) $ 8,002 $ 6,517 $ 3,706 $ (17,914) $ 9,672 $ 3,915 $ 1,248 $ 690 $ 6,232 $ 17,884 $ 15,525
Adjustments to reconcile net income (loss) to net cash provided by    operating activities:                                
Depreciation and amortization                 7,544       4,288 25,179 22,843 17,861
Restructuring loss                 22,176       0 2,641 (5,982) 0
Stock-based compensation expense                 3,683       3,640 19,682 15,488 16,821
Amortization of debt issuance costs and discount on debt                 190       199 847 747 792
Deferred income taxes                 (3,433)       735 (8,584) 2,443 (939)
Other, net                 242       142 383 873 476
Changes in operating assets and liabilities:                                
Accounts receivable                 4,215       12,771 (10,529) 2,504 7,649
Inventories                 2,561       951 (10,937) (435) 16,338
Prepaid expenses and other assets                 (1,732)       (1,498) (9,659) (6,500) (8,484)
Accounts payable and accrued expenses                 (6,021)       (16,891) 17,472 5,962 (10,251)
Other liabilities                 (3,295)       3 (3,252) (11,514) (206)
Net cash provided by operating activities                 8,216       5,030 29,475 44,313 55,582
Cash flows from investing activities:                                
Purchase of property and equipment                 (3,400)       (2,667) (6,474) (9,422) (8,872)
Net cash used in investing activities                 (3,400)       (2,667) (6,474) (35,345) (8,872)
Cash flows from financing activities:                                
Proceeds from revolving line of credit                 0       2,000 20,000 0 2,000
Repayment of revolving line of credit                 0       (2,000) (20,000) 0 (2,000)
Repayment of long-term debt                 (2,063)       (2,063) (11,756) (9,488) (8,250)
Cash received from issuance of common stock                 115       212 1,503 1,488 3,176
Other, net                 (199)       (97) (813) (771) (490)
Net cash used in financing activities                 (2,147)       (1,948) (11,400) (16,675) (5,564)
Net increase (decrease) in cash and cash equivalents                 2,669       415 11,601 (7,707) 41,146
Cash and cash equivalents - beginning of period       $ 46,167       $ 53,874 51,205     $ 10,474 10,059 46,167 53,874 10,059
Cash and cash equivalents - end of period $ 57,768       $ 46,167       $ 53,874 $ 51,205     $ 10,474 $ 57,768 $ 46,167 $ 51,205