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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net loss $ (18,633,520) $ (16,116,384)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and other amortization 33,929 75,837
Increase in fair value of warrant liability 2,942,829 331,853
Stock-based compensation 689,721 373,492
Deferred income taxes (benefit) provision (9,777) 21,190
Write down of inventory 0 536,000
Non-cash interest expense 2,230,153 2,230,154
Changes in assets and liabilities:    
Accounts receivable (219,547) 1,385,389
Inventory 0 10,257,156
Deferred costs 54,776 (10,540,755)
Prepaid expenses and other current assets 705,066 382,780
Accounts payable, accrued expenses and other current liabilities (854,097) (528,807)
Deferred revenue (553,755) 8,996,221
Other liabilities (135,395) (9,666)
Net cash used in operating activities (13,749,617) (2,605,540)
Cash flows from investing activities:    
Capital expenditures (27,863) (39,326)
Net cash (used in) investing activities (27,863) (39,326)
Cash flows from financing activities:    
Net proceeds from exercise of stock options 0 27,497
Buy back of stock options 0 (84,000)
Payment of employee tax obligations for common stock tendered 12,327 193,052
Net cash (used in) financing activities (12,327) (249,555)
Net decrease in cash and cash equivalents (13,789,807) (2,894,421)
Cash, cash equivalents and restricted cash at the beginning of period 37,101,586 56,174,046
Cash, cash equivalents and restricted cash at end of period $ 23,311,779 $ 53,279,625