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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 29, 2019
Sep. 30, 2018
Cash flows from operating activities:    
Net loss $ (105,566) $ (36,410)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 10,950 3,406
Premium amortization / discount accretion on investments, net (391) (3)
Stock-based compensation expense 15,261 5,336
Deferred income taxes (109) (438)
Changes in assets and liabilities:    
Accounts receivable, net 66,348 (69,724)
Inventories 50,675 (50,009)
Prepaid expenses and other assets (1,729) (17,319)
Accounts payable (24,381) 53,717
Deferred revenue (1,996) 7,169
Accrued and other liabilities (51,777) 57,966
Net cash used in operating activities (42,715) (46,309)
Cash flows from investing activities:    
Purchases of property and equipment (5,023) (10,854)
Purchases of short-term investments (29,768) (39,774)
Proceeds from maturities of short-term investments 40,000 0
Net cash provided (cash used) by investing activities 5,209 (50,628)
Cash flows from financing activities:    
Proceeds from initial public offering, net of offering costs 0 173,395
Proceeds related to employee benefit plans 1,837 0
Restricted stock unit withholdings (1,755) 0
Net investment from parent 0 71,507
Net cash provided by financing activities 82 244,902
Net increase (decrease) in cash and cash equivalents and restricted cash (37,424) 147,965
Cash and cash equivalents and restricted cash, at beginning of period 155,424 108
Cash and cash equivalents and restricted cash, at end of period 118,000 148,073
Non-cash investing and financing activities:    
Purchases of property and equipment included in accounts payable and accrued liabilities 1,578 5,279
De-recognition of build-to-suit assets and liabilities (21,610) 0
Estimated fair value of a facility under build-to-suit lease $ 0 $ 21,858