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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:    
Net loss $ (4,398) $ (6,143)
Adjustments to reconcile net loss from operations to net cash used in operating activities:    
Stock-based compensation 98 242
Amortization 6 7
Depreciation 136 386
Net loss on sale of available-for-sale investments 31 34
Changes in assets and liabilities:    
Accounts receivable 4 136
Accounts payable 107 26
Other assets and liabilities (214) (537)
Net cash used in operating activities (4,230) (5,849)
Cash flows from investing activities:    
Sale of available-for-sale investments 3,345 3,615
Maturities of available-for-sale securities 250 700
Sale of property and equipment 2 0
Purchases of property and equipment 0 (14)
Net cash provided by investing activities 3,597 4,301
Cash flows from financing activities:    
Payments for purchase of treasury stock (1) (3)
Proceeds from exercise of stock options 7 0
Proceeds from issuance of common stock, net of offering costs 2,921 0
Net cash provided by (used in) financing activities 2,927 (3)
Net change in cash and cash equivalents 2,294 (1,551)
Cash and cash equivalents at beginning of period 552 2,184
Cash and cash equivalents at end of period 2,846 633
Supplemental disclosures of cash flow information:    
Cash paid for interest 0 0
Income taxes paid $ 0 $ 0