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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (81,809) $ (84,990)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 4,372 3,156
Stock-based compensation 17,063 14,369
Accretion on asset retirement obligation 62 22
Change in fair value of warrant liabilities (1,281) (4,674)
Loss on disposal of property and equipment 121 0
Inventory lower of cost or net realizable value adjustment 150 0
Amortization of debt discount and interest accrual 527 472
Product upgrade reserve (1,260) 4,431
Changes in operating assets and liabilities:    
Accounts receivable (9,731) 3,566
Inventory 8,425 (10,514)
Deposits on purchased inventory 2,203 3,259
Deferred cost of revenue (6,937) 1,951
Prepaid expenses and other assets (1,268) 852
Accounts payable (6,031) 1,231
Accrued expenses and other long-term liabilities (1,416) 4,774
Customer deposits and deferred revenue 17,130 (14,537)
Net cash used in operating activities (59,680) (76,632)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (2,201) (7,541)
Purchase of intangible asset 0 (57)
Net cash used in investing activities (2,201) (7,598)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payment of debt issuance cost 0 (168)
Proceeds from the exercise of stock options 15 9,641
Proceeds from employee stock purchase plan 313 0
Payments for taxes related to net share settlement of equity awards (754) (2,410)
Net cash (used in) provided by financing activities (965) 7,063
NET (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH (62,846) (77,167)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — BEGINNING OF PERIOD 228,187 169,365
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — END OF PERIOD 165,341 92,198
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Cash paid for interest 2,695 2,879
Cash paid for taxes 28 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 3,976
Right-of-use assets obtained in exchange for new operating lease liabilities 0 1,647
Transfer of property and equipment from inventory and deferred cost of revenue 1,698 4,446
Purchases of property and equipment in accounts payable and accrued liabilities 381 491
Public Offering    
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payment of offering costs related to common stock public offering $ (539) $ 0