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Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities:    
Net loss $ (4,620) $ (8,993)
Adjustments to reconcile net loss to net cash used in operating activities:    
Share-based compensation 770 1,410
Depreciation and amortization 15 16
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (94) 144
Accounts payable (610) (597)
Accrued liabilities (1,222) 1,289
Net cash used in operating activities (5,761) (6,731)
Cash flows from investing activities:    
Purchases of short-term investments (20,125) (4,998)
Proceeds from maturity of short-term investments 25,040 14,993
Net cash provided by investing activities 4,915 9,995
Net increase (decrease) in cash and cash equivalents (846) 3,264
Cash and cash equivalents at beginning of the period 18,722 13,777
Cash and cash equivalents at end of the period $ 17,876 $ 17,041