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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |
Net income (loss) | $ 21,111 | $ (142,542) | $ (141,090)
Reconciliation of net income (loss) to net cash provided by (used in) operating activities: |  |  |
Depreciation and amortization | 4,024 | 2,400 | 1,453
Amortization of debt discount | 17,552 | 10,937 | 0
Amortization of debt issuance costs | 1,326 | 848 | 0
Amortization of premiums on investments | 1,449 | 1,756 | 3,520
Share-based compensation expense | 58,068 | 42,522 | 28,464
Deferred rent | 351 | 1,203 | (294)
Gain on sales of assets, net | (760) | (2,104) | (3,431)
Cease-use expense | 0 | (544) | (584)
Change in operating assets and liabilities: |  |  |
Accounts receivable | (25,113) | (31,127) | 0
Inventory | (3,524) | (1,024) | 0
Reimbursements for tenant improvements | 8,701 | 0 | 0
Accounts payable and accrued liabilities | 24,223 | 27,338 | 4,398
Other current assets and liabilities, net | (6,044) | (3,994) | 1,383
Net cash provided by (used in) operating activities | 101,364 | (94,331) | (106,181)
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |
Purchases of investments | (545,962) | (583,408) | (298,776)
Sales and maturities of investments | 327,825 | 339,088 | 415,826
Purchases of property and equipment | (24,812) | (6,940) | (4,108)
Proceeds from sales of property and equipment | 34 | 7 | 13
Net cash (used in) provided by investing activities | (242,915) | (251,253) | 112,955
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |
Issuance of common stock | 29,530 | 13,865 | 2,390
Proceeds from issuance of senior convertible notes, net | 0 | 502,781 | 0
Net cash provided by financing activities | 29,530 | 516,646 | 2,390
Net change in cash, cash equivalents, and restricted cash | (112,021) | 171,062 | 9,164
Cash, cash equivalents, and restricted cash at beginning of the period | 259,212 | 88,150 | 78,986
Cash, cash equivalents, and restricted cash at end of the period | 147,191 | 259,212 | 88,150
SUPPLEMENTAL DISCLOSURES |  |  |
Cash paid for interest | 11,644 | 6,242 | 0
Non-cash capital expenditures | $ 2,318 | $ 0 | $ 0

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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration