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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Operating activities    
Net loss $ (89,943) $ (64,938)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation expense 4,734 3,129
Noncash lease expense 3,489 1,344
Share-based compensation expense 19,733 11,048
Intangible assets amortization 842 847
Investment amortization 4,174 (651)
Benefit from income tax   (1,804)
Other (7) 49
Changes in operating assets and liabilities:    
Accounts receivable, net (4,127) 4,746
Inventory (4,549) (1,467)
Prepaid expenses and other current assets 1,995 4,206
Accounts payable and accrued liabilities (2,476) (1,891)
Operating lease liabilities 4,539 79
Deferred revenue (33,742) (17,165)
Other (120) (215)
Net cash used in operating activities (95,458) (62,683)
Investing activities    
Purchases of property and equipment (37,882) (5,226)
Purchases of marketable securities (96,352) (107,747)
Proceeds from sales and maturities of marketable securities 269,500 433,224
Net cash provided by investing activities 135,266 320,251
Financing activities    
Proceeds from exercise of stock options 20,513 11,296
Proceeds from initial capital contributions for Spin Technologies, Inc. 429  
Net cash provided by financing activities 20,942 11,296
Net increase in cash, cash equivalents and restricted cash 60,750 268,864
Cash, cash equivalents and restricted cash at beginning of year 125,574 98,714
Cash, cash equivalents and restricted cash at end of period 186,324 367,578
Noncash investing and financing activities    
Purchases of equipment included in accounts payable and accrued liabilities $ 7,067 1,736
Deferred offering costs included in accounts payable and accrued liabilities   277
Derecognition of lease financing arrangements upon adoption of guidance on accounting for leases   $ 36,607