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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (53,684) $ (64,159)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 2,957 2,033
Stock-based compensation 11,304 9,459
Accretion on asset retirement obligation 41 14
Change in fair value of warrant liabilities (3,301) 6,935
Loss on disposal of property and equipment 12 0
Inventory lower of cost or net realizable value adjustment 150 0
Amortization of debt discount and interest accrual 357 184
Product upgrade reserve (1,260) 5,523
Changes in operating assets and liabilities:    
Accounts receivable (5,272) 1,392
Inventory 6,684 (8,810)
Deposits on purchased inventory 1,814 2,350
Deferred cost of revenue (4,390) (577)
Prepaid expenses and other assets (2,327) 796
Accounts payable (8,470) 8,256
Accrued expenses and other long-term liabilities (1,865) 3,791
Customer deposits and deferred revenue 12,232 (16,739)
Net cash used in operating activities (45,018) (49,552)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (1,295) (4,353)
Net cash used in investing activities (1,295) (4,353)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payment of debt issuance cost 0 (168)
Proceeds from the exercise of stock options 15 8,203
Proceeds from employee stock purchase plan 156 0
Payments for taxes related to net share settlement of equity awards (132) 0
Net cash (used in) provided by financing activities (500) 8,035
NET (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH (46,813) (45,870)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — BEGINNING OF PERIOD 228,187 169,365
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — END OF PERIOD 181,374 123,495
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Cash paid for interest 2,140 1,811
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 2,105
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 1,583 4,394
Purchases of property and equipment in accounts payable and accrued liabilities 65 1,146
Public Offering    
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payment of offering costs related to common stock public offering $ (539) $ 0