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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities:    
Net loss $ (2,994) $ (14,542)
Adjustments to reconcile net loss to net cash used in operating activities:    
Change in fair value of warrant liability (9,269) 4,962
Share-based compensation 2,113 1,937
Depreciation and amortization 31 13
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 300 (2,085)
Accounts payable (1,689) (2,088)
Accrued liabilities (1,702) (965)
Deferred revenue (868) (48)
Net cash used in operating activities (14,078) (12,816)
Cash flows from investing activities:    
Purchases of short-term investments (19,979) (4,937)
Proceeds from maturity of short-term investments 24,946 9,725
Net cash provided by investing activities 4,967 4,788
Cash flows from financing activities:    
Proceeds from exercise of stock options 72 43
Proceeds from exercise of warrants   1,118
Proceeds from issuance of common stock 159  
Collection of common stock proceeds receivable 5,274  
Payment of RSU tax withholdings in exchange for common shares surrendered by RSU holders   (324)
Net cash provided by financing activities 5,505 837
Net decrease in cash and cash equivalents (3,606) (7,191)
Cash and cash equivalents at beginning of the period 9,590 13,309
Cash and cash equivalents at end of the period 5,984 6,118
Supplemental cash flow information:    
Income taxes paid $ (1) (1)
Non-cash financing activities:    
Change in fair value of warrants exercised   $ 1,068