SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Oct. 01, 2019	Sep. 30, 2018
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Total revenue recognized	$ 60,469	$ 43,616
Allowance for Doubtful Accounts Receivable, Current	561	1,759
Depreciation	3,126	2,223
Goodwill	4,368	3,617
Total amount of intangible assets subject to amortization	4,261	2,883		$ 3,334
Amortization of Intangible Assets	703	451
Research and Development Expense	950	627
Debt Issuance Costs, Noncurrent, Net	235	207
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	751
Finance right-of-use assets	4,778	0
Finance lease liability	4,772
Operating right-of -use asset	4,001	0
Operating lease liability	4,210
Straight-line rent per month	53
Variance between the straight-line rents recognized and the actual cash rents received	$ 0
Restatement | Accounting Standards Update 2016-02 [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Finance right-of-use assets			$ 4,628
Finance lease liability			4,650
Operating right-of -use asset			4,581
Operating lease liability			$ 4,687
Building and Building Improvements [Member] | Minimum
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Property, Plant and Equipment, Useful Life	34 years
Building and Building Improvements [Member] | Maximum
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Property, Plant and Equipment, Useful Life	40 years
Machinery and Equipment [Member] | Minimum
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Property, Plant and Equipment, Useful Life	5 years
Machinery and Equipment [Member] | Maximum
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Property, Plant and Equipment, Useful Life	10 years
Furniture and Fixtures [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Property, Plant and Equipment, Useful Life	10 years
Royalty revenue [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Total revenue recognized	$ 641	$ 349