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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (26,743) $ (27,532)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 1,648 1,463
Stock-based compensation 8,494 5,501
Accretion on asset retirement obligation 33 20
Change in fair value of warrant liabilities 947 (2,869)
Loss on disposal of property and equipment 0 12
Amortization of debt discount and interest accrual 239 177
Product upgrade reserve 600 (1,260)
Changes in operating assets and liabilities:    
Accounts receivable (4,800) (4,673)
Inventory 2,783 0
Deposits on purchased inventory (466) 2,222
Deferred cost of revenue (356) (952)
Prepaid expenses and other assets 420 (2,680)
Accounts payable (2,391) (6,415)
Accrued expenses and other long-term liabilities (6,130) (3,702)
Customer deposits and deferred revenue (585) 5,689
Net cash used in operating activities (26,307) (34,999)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (336) (451)
Net cash used in investing activities (336) (451)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from the exercise of stock options 19 2
Proceeds from the exercise of warrants 2 0
Payments for taxes related to net share settlement of equity awards (1,473) (132)
Net cash (used in) provided by financing activities 51,942 (669)
NET INCREASE (DECREASE) IN CASH DURING THE PERIOD 25,299 (36,119)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — BEGINNING OF PERIOD 158,180 228,187
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — END OF PERIOD 183,479 192,068
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Cash paid for interest 819 1,070
Cash paid for income taxes 0 0
SUPPLEMENTAL NON-CASH INVESTING AND FINANCING ACTIVITIES:    
Fair value of common stock warrants reclassified from liability to additional paid-in capital upon exercise 327 0
Transfer of property and equipment from inventory and deferred cost of revenue 0 864
Purchases of property and equipment in accounts payable and accrued liabilities 129 986
Offering costs included in accounts payable and accrued expenses 0 191
Public Offering    
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from common stock public offering, gross 57,385 0
Payment of offering costs related to common stock public offering $ (3,991) $ (539)