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Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Jun. 30, 2013
Current assets:    
Cash and cash equivalents $ 19,670 $ 35,573
Short-term investments 35,007  
Total cash, cash equivalents and short-term investments 54,677 35,573
Prepaid expenses and other current assets 861 456
Total current assets 55,538 36,029
Intangible assets, net 444 470
Property and equipment, net 61 48
Total assets 56,043 36,547
Current liabilities:    
Accounts payable 700 537
Accrued liabilities 2,818 1,138
Total current liabilities 3,518 1,675
Commitments and contingencies (Note 3)      
Stockholders' equity:    
Preferred stock, $0.01 par value; 100,000 shares authorized; none outstanding      
Common stock, $0.00000002 par value; 113,000,000 shares authorized; 21,607,234 shares and 17,116,571 shares issued and outstanding at March 31, 2014 and June 30, 2013, respectively      
Additional paid-in-capital 167,429 131,169
Deficit accumulated during the development stage (114,904) (96,297)
Total stockholders' equity 52,525 34,872
Total liabilities and stockholders' equity $ 56,043 $ 36,547