Quarterly Results of Operations (Unaudited) - Summary of Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	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, 2020	Sep. 30, 2019
Quarterly Financial Information Disclosure [Abstract]
Sales	$ 12,239	$ 12,022	$ 11,959	$ 13,962	$ 17,859	$ 17,559	$ 12,890	$ 6,810
Gross profit	4,356	4,171	(439)	3,592	3,671	4,587	3,477	1,723	$ 11,680	$ 13,458
Loss from continuing operations	$ (978)	$ 23	$ (14,661)	$ (1,718)	$ (1,562)	$ (58)	$ (1,211)	$ (1,203)	$ (17,333)	$ (4,035)
Basic loss from continuing operations per common share (in dollars per share)	$ (0.09)	$ 0	$ (1.41)	$ (0.17)	$ (0.15)	$ 0	$ (0.12)	$ (0.12)	$ (1.55)	$ (0.39)
Diluted loss from continuing operations per common share (in dollars per share)									$ 0	$ (0.12)