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Consolidated Statements of Cash Flows - USD ($)
9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ 56,269,944 $ (43,689,207)
Change in value of derivatives   (432,141)
Stock-based compensation 7,276,875 5,818,119
Depreciation and amortization 3,356,769 3,470,880
Amortization/(accretion) of note premiums 682,243 582,373
Changes in operating assets and liabilities:    
Accounts receivable (1,716,736) 52,822
Prepaid expenses and other current assets (2,393,230) 856,253
Deferred revenue 97,940,261 (4,326,540)
Accounts payable 1,824,146 (1,910,782)
Accrued expenses (3,477,235) (4,652,873)
Other (538,020) (312,003)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES 159,225,017 (44,543,099)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (4,170,285) (711,779)
Purchases of marketable securities (90,266,001) (47,174,620)
Proceeds from sale of marketable securities 29,861,219 37,204,420
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES (64,575,067) (10,681,979)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Principal payments on notes payable (2,415,150) (154,986)
Payments of taxes for net share settled restricted stock unit issuances   (54,667)
Proceeds from the exercises of warrants and stock options 6,442,005 2,006,515
Proceeds from the issuance of common stock 60,521,729 56,585,035
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES 64,548,584 58,381,897
NET INCREASE (DECREASE) IN CASH 159,198,534 3,156,819
CASH AND RESTRICTED CASH AT BEGINNING OF PERIOD 30,133,213 24,838,567
CASH AND RESTRICTED CASH AT END OF PERIOD 189,331,747 27,995,386
Supplementary disclosures:    
Interest paid (27,437) (131,429)
Income taxes paid $ (2,400) $ (2,400)