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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Cash flows from operating activities:              
Net loss $ (2,083) $ (2,068) $ (2,160) $ (2,238) $ (4,151) $ (4,398)  
Adjustments to reconcile net loss to net cash used in operating activities:              
Stock-based compensation         187 98  
Depreciation and amortization         289 142  
Net loss on sale of available-for-sale investments         0 31  
Changes in assets and liabilities:              
Accounts receivable         (210) 4  
Inventory         57 0  
Income tax receivable         215 0  
Accounts payable         (7) 107  
Other assets and liabilities         264 (214)  
Net cash used in operating activities         (3,356) (4,230) $ (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         1,500 0  
Proceeds from exercise of stock options         0 7  
Proceeds from issuance of stock, net of offering issuance costs         1,272 2,921  
Net cash provided by financing activities         2,772 2,927  
Net change in cash and cash equivalents and restricted cash         (584) 2,294  
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 1,004   2,846   1,004 2,846 1,588
Reconciliation of cash and cash equivalents and restricted cash at end of period:              
Cash and cash equivalents 393   0   393 0 $ 1,588
Restricted cash 611   0   611 0  
Total reconciliation of cash and cash equivalents and restricted cash at end of period $ 1,004   $ 0   1,004 0  
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