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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net loss $ (11,582,256) $ (8,614,946)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and other amortization 29,790 36,175
Increase in fair value of warrant liability 3,303,114 626,209
Stock-based compensation 327,360 87,594
Deferred income taxes (benefit) provision (9,758) 21,190
Non-cash interest expense 1,108,916 1,108,916
Changes in assets and liabilities:    
Accounts receivable 645,730 (1,724,261)
Inventory 0 7,090,409
Deferred costs 184,864 (6,389,282)
Prepaid expenses and other current assets 119,433 22,423
Accounts payable, accrued expenses and other current liabilities (2,792,043) (1,894,379)
Deferred revenue 169,269 8,719,141
Other liabilities (66,122) (22,165)
Net cash used in operating activities (8,561,703) (932,976)
Cash flows from investing activities:    
Net cash provided by (used in) investing activities 0 0
Cash flows from financing activities:    
Payment of employee tax obligations for common stock tendered 0 193,052
Net cash (used in) financing activities 0 (193,052)
Net decrease in cash and cash equivalents (8,561,703) (1,126,028)
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 $ 28,539,883 $ 55,048,018