Selected Quarterly Financial Data (Unaudited) - Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended									12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	$ 81,083		$ 129,139		$ 152,498	$ 138,600				$ 501,320	$ 595,942	$ 606,544
Cost of goods sold	65,536		91,190		108,513	97,959				363,198	416,840	399,155
Gross profit	15,547		37,949		43,985	40,641				138,122	179,102	207,389
Selling expenses	21,274		31,968		34,906	33,614				121,762	139,647	153,391
Income (loss) from operations	(13,595)		(45,169)		8,870	6,892				(43,002)	(14,702)	1,053
Net loss	$ (9,718)		$ (39,777)		$ 7,754	$ 4,654				$ (37,087)	$ (73,595)	$ (18,280)
Net income (loss) per common share - basic (in US$ per share)	$ (0.57)		$ (2.32)	$ (1.11)	$ 0.44	$ 0.26				$ (2.19)	$ (4.36)	$ (1.11)
Net income (loss) per common share - diluted (in US$ per share)	$ (0.57)		$ (2.32)	$ (1.11)	$ 0.43	$ 0.26				$ (2.19)	$ (4.36)	$ (1.11)
As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales		$ 142,050					$ 146,679	$ 159,773	$ 147,440
Cost of goods sold		104,327					106,779	106,529	99,205
Gross profit		37,723					39,900	53,244	48,235
Selling expenses		28,324					34,422	39,591	37,310
Income (loss) from operations		(7,024)					(6,102)	502	(2,078)
Net loss		$ (8,760)					$ (51,749)	$ (10,100)	$ (2,986)
Net income (loss) per common share - basic (in US$ per share)		$ (0.52)					$ (3.05)	$ (0.60)	$ (0.18)
Net income (loss) per common share - diluted (in US$ per share)		$ (0.52)					$ (3.05)	$ (0.60)	$ (0.18)