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STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:      
Net loss $ (46,016) $ (16,819) $ (40,068)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:      
Change in fair value of warrant liability 22,870 (27,632) 9,705
Financing costs associated with warrants     2,367
Share-based compensation 6,801 6,562 3,217
Impairment of intangible assets 227    
Depreciation and amortization 109 80 53
Changes in operating assets and liabilities:      
Receivable for foreign tax withholding (20,420)    
Prepaid expenses and other current assets (3,159) (849) 172
Accounts payable (2,350) 1,144 3,058
Accrued liabilities 1,470 1,105 669
Deferred revenue 74,726 6,986 (208)
Net cash provided by (used in) operating activities 34,258 (29,423) (21,035)
Cash flows from investing activities:      
Purchases of property and equipment (894) (217)  
Purchases of short-term investments (190,279) (64,655) (114,233)
Proceeds from maturity of short-term investments 84,879 89,190 69,906
Net cash (used in) provided by investing activities (106,294) 24,318 (44,327)
Cash flows from financing activities:      
Proceeds from exercise of stock options 272 372 329
Issuance of common stock, net 69,231 220 70,151
Collection of common stock proceeds receivable 5,274    
Proceeds from exercise of warrants 0 1,118  
Payment of RSU tax withholdings in exchange for common shares surrendered by RSU holders   (324) (267)
Net cash provided by financing activities 74,777 1,386 70,213
Net increase (decrease) in cash and cash equivalents 2,741 (3,719) 4,851
Cash and cash equivalents at beginning of the period 9,590 13,309 8,458
Cash and cash equivalents at end of the period 12,331 9,590 13,309
Supplemental cash flow information:      
Income taxes paid $ (1) (1) $ (1)
Non-cash financing activities:      
Proceeds receivable- sale of common stock   5,224  
Proceeds receivable- stock option exercises   50  
Change in fair value of warrants exercised   $ 1,068