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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (27,532) $ (33,361)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 1,463 946
Stock-based compensation 5,501 4,552
Accretion on asset retirement obligation 20 7
Change in fair value of warrant liabilities (2,869) 3,120
Loss on disposal of property and equipment 12 0
Amortization of debt discount and interest accrual 177 141
Product upgrade reserve (1,260) 5,601
Changes in operating assets and liabilities:    
Accounts receivable (4,673) 9,435
Inventory 0 (15,795)
Deposits on purchased inventory 2,222 500
Deferred cost of revenue (952) 4,628
Prepaid expenses and other assets (2,680) (3,009)
Accounts payable (6,415) 7,048
Accrued expenses and other long-term liabilities (3,702) 1,278
Customer deposits and deferred revenue 5,689 (8,744)
Net cash used in operating activities (34,999) (23,653)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (451) (1,249)
Net cash used in investing activities (451) (1,249)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payment of debt issuance cost 0 (168)
Proceeds from the exercise of stock options 2 2,884
Payments for taxes related to net share settlement of equity awards (132) 0
Net cash (used in) provided by financing activities (669) 2,716
NET (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH (36,119) (22,186)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — BEGINNING OF PERIOD 228,187 169,365
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — END OF PERIOD 192,068 147,179
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Cash paid for interest 1,070 750
Cash paid for taxes 0 7
SUPPLEMENTAL NON-CASH INVESTING AND FINANCING ACTIVITIES:    
Fair value of common stock warrants reclassified from liability to additional paid-in capital upon exercise 0 92
Right-of-use assets obtained in exchange for new operating lease liabilities 0 492
Transfer of property and equipment from inventory and deferred cost of revenue 864 246
Purchases of property and equipment in accounts payable and accrued liabilities 986 615
Offering costs included in accounts payable and accrued expenses 191 0
Public Offering    
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payment of offering costs related to common stock public offering $ (539) $ 0