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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net loss $ (4,814) $ (27,961)  
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 658 467  
Stock-based compensation 1,190 769  
Accretion on asset retirement obligation 10 9  
Change in fair value of warrant liabilities (8,182) 15,231  
Loss on disposal of property and equipment 0 6  
Amortization of debt discount and interest accrual 870 785  
Changes in operating assets and liabilities:      
Accounts receivable (5,845) 928  
Inventory (12,021) (2,134)  
Deposits on purchased inventory (2,958) (1,951)  
Deferred cost of revenue 9,126 (2,341)  
Prepaid expenses and other assets 282 (1,675)  
Accounts payable 2,081 560  
Accrued expenses and other long-term liabilities 725 (138)  
Customer deposits and deferred revenue (18,576) 5,481  
Net cash used in operating activities (37,454) (11,964)  
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchase of property and equipment (497) (319)  
Net cash used in investing activities (497) (319)  
CASH FLOWS FROM FINANCING ACTIVITIES:      
Proceeds from common stock private placement, gross 0 26,100  
Proceeds from the exercise of stock options 378 2  
Net cash provided by financing activities 59,478 47,386  
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 21,527 35,103  
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — BEGINNING OF PERIOD 58,532 15,341 $ 15,341
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — END OF PERIOD 80,059 50,444 58,532
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:      
Cash paid for interest 996 951  
SUPPLEMENTAL NON-CASH INVESTING AND FINANCING ACTIVITIES:      
Purchase of property and equipment in accounts payable and accrued expenses 228 135  
Transfer of property and equipment from inventory and deferred cost of revenue 1,415 0  
Offering cost in accounts payable and accrued expenses 177 394  
Private Placement      
CASH FLOWS FROM FINANCING ACTIVITIES:      
Payment of offering costs related to common stock issuance 0 (210)  
At The Market Offering Program      
CASH FLOWS FROM FINANCING ACTIVITIES:      
Payment of offering costs related to common stock issuance 0 (427)  
Proceeds from offering of common stock, gross 0 21,921 $ 40,100
Direct Registered Offering      
CASH FLOWS FROM FINANCING ACTIVITIES:      
Proceeds from offering of common stock, gross $ 59,100 $ 0