Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended				9 Months Ended		12 Months Ended
	Mar. 31, 2020	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2019
Cash flows from operating activities:
Net loss	$ (2,068)	$ (2,068)	$ (1,394)	$ (2,238)	$ (6,219)	$ (5,792)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation					282	205
Depreciation and amortization					327	206
Deferred income tax benefit					0	(429)
Net loss on sale of available-for-sale investments					0	31
Changes in assets and liabilities:
Accounts receivable					(82)	(29)
Inventory					(262)	0
Income tax receivable					0	(429)
Accounts payable					28	27
Other assets and liabilities					970	(340)
Net cash used in operating activities					(4,956)	(6,550)	$ (8,500)
Cash flows from investing activities:
Proceeds from sale of available-for-sale investments					0	3,345
Proceeds from maturities of securities					0	250
Sale of property and equipment					0	2
Net cash provided by investing activities					0	3,597
Cash flows from financing activities:
Payments for purchase of treasury stock					0	(1)
Proceeds from term note payable - related party					2,500	0
Proceeds from exercise of stock options					0	7
Proceeds from issuance of stock, net of offering issuance costs					5,650	3,919
Net cash provided by financing activities					8,150	3,925
Net change in cash and cash equivalents and restricted cash					3,194	972
Cash and cash equivalents and restricted cash at beginning of period		1,588		$ 552	1,588	552	552
Cash and cash equivalents and restricted cash at end of period	4,782		1,524		4,782	1,524	1,588
Reconciliation of cash and cash equivalents and restricted cash at end of period:
Cash and cash equivalents	4,660		1,524		4,660	1,524	$ 1,588
Restricted cash	122		0		122	0
Total reconciliation of cash and cash equivalents and restricted cash at end of period	$ 4,782		$ 1,524		4,782	1,524
Supplemental disclosures of cash flow information:
Cash paid for interest					0	0
Income taxes paid					0	0
Operating right-of-use assets and associated liabilities					1,608	0
ASU 2016-02
Supplemental disclosures of cash flow information:
Impact to retained earnings from adoption of ASC Topic 842		$ 230			$ 230	$ 0