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Selected Quarterly Financial Data (Unaudited) - Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Net sales $ 142,050 $ 146,679 $ 149,538 $ 159,773 $ 147,440   $ 157,927 $ 167,366 $ 131,713 $ 595,942 $ 606,544 $ 541,500
Cost of goods sold 104,327 106,779 96,806 106,529 99,205   105,629 111,089 85,630 416,840 399,155 354,649
Gross profit 37,723 39,900 52,732 53,244 48,235   52,298 56,277 46,083 179,102 207,389 186,851
Selling expenses 28,324 34,422 40,655 39,591 37,310   37,754 42,127 32,856 139,647 153,391 133,534
Income (loss) from operations (7,024) (6,102) 1,984 502 (2,078)   (2,785) 10 1,845 (14,702) 1,053 38,934
Net (loss) income $ (8,760) $ (51,749) $ 133 $ (10,100) $ (2,986)   $ (2,193) $ (17,060) $ 841 $ (73,595) $ (18,280) $ 22,551
Net income (loss) per common share - basic (in US$ per share) $ (0.52) $ (3.05) $ 0.00 $ (0.60) $ (0.18) $ 1.35 $ (0.14) $ (1.03) $ 0.05 $ (4.36) $ (1.11) $ 1.35
Net income (loss) per common share - diluted (in US$ per share) $ (0.52) $ (3.05) $ 0.00 $ (0.60) $ (0.18) $ 1.34 $ (0.14) $ (1.03) $ 0.05 $ (4.36) $ (1.11) $ 1.34
As Previously Reported                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Net sales     $ 149,538       $ 157,927 $ 167,366 $ 131,713      
Cost of goods sold     96,939       105,716 111,175 85,672   $ 399,502 $ 354,622
Gross profit     52,599       52,211 56,191 46,041   207,042 186,878
Selling expenses     41,256       38,041 42,414 32,828   154,539 133,329
Income (loss) from operations     2,001       (2,767) 28 1,862   $ 1,124 $ 39,178
Net (loss) income     $ 133       $ (2,193) $ (17,060) $ 840      
Net income (loss) per common share - basic (in US$ per share)     $ 0.00       $ (0.14) $ (1.03) $ 0.05      
Net income (loss) per common share - diluted (in US$ per share)     $ 0.00       $ (0.14) $ (1.03) $ 0.05