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Condensed Statements of Cash Flows - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash Flows From Operating Activities    
Net loss $ (19,283) $ (7,168)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 691 23
Fair value of vested stock options 4,223 1,896
Vesting of restricted shares issued for services 1,553 825
Changes in assets and liabilities:    
Prepaid and other current assets (179) 118
Accounts payable and accrued expenses 1,193 (1,012)
Net cash used in operating activities (11,802) $ (5,318)
Cash Flows From Investing Activities    
Increase in money market funds (20,562)
Purchase of short-term investments (95,236)
Maturities of short-term investments 15,900
Purchases of property and equipment (992) $ (167)
Net cash used in investing activities (100,890) (167)
Cash Flows From Financing Activities    
Proceeds from the issuance of common stock upon exercise of warrants 9,618 $ 3,002
Proceeds from the issuance of common stock upon exercise of options 66  
Proceeds from the issuance of common stock, net 68,308
Net cash provided by financing activities 77,992 $ 3,002
Net Decrease In Cash And Cash Equivalents (34,700) (2,483)
Cash and Cash Equivalents, Beginning of Period 44,910 19,673
Cash and Cash Equivalents, End of Period 10,210 $ 17,190
Supplement non-cash financing activities    
Unrealized gain on short-term investments $ 38