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v3.21.1

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Operating activities: |  |
Net loss | $ (89,869) | $ (49,882)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation | 3,917 | 3,233
Amortization of right-of-use operating lease assets | 394 | 393
Amortization of patents | 544 | 486
Amortization of premium (discount) on investments, net | 4,023 | 1,062
Amortization of debt issuance costs | 860 | 647
Stock-based compensation expense | 37,861 | 40,790
Gain on investments | (13) | (246)
Non-cash losses related to patents | 221 | 159
Provision for deferred income taxes | 0 | (2,288)
Changes in operating assets and liabilities: |  |
Contracts receivable | 52,807 | 34,429
Inventories | (234) | (2,181)
Other current and long-term assets | 16,481 | 9,532
Income taxes payable | 2 | (532)
Accounts payable | (9,569) | 411
Accrued compensation | (36,465) | (20,920)
Accrued liabilities and other current liabilities | (11,905) | (3,006)
Deferred contract revenue | (23,717) | (19,679)
Net cash used in operating activities | (54,662) | (7,592)
Investing activities: |  |
Purchases of short-term investments | (330,051) | (544,375)
Proceeds from sale of short-term investments | 411,907 | 459,352
Purchases of property, plant and equipment | (1,772) | (9,080)
Acquisition of licenses and other assets, net | (1,228) | (904)
Net cash provided by (used in) investing activities | 78,856 | (95,007)
Financing activities: |  |
Proceeds from equity, net | 7,760 | 7,652
Payments of tax withholdings related to vesting of employee stock awards and exercise of employee stock options | (15,337) | (11,603)
Repurchases and retirements of common stock | 0 | (90,550)
Net cash used in financing activities | (7,577) | (94,501)
Effects of exchange rates on cash | (126) | 8
Net increase (decrease) in cash and cash equivalents | 16,491 | (197,092)
Cash and cash equivalents at beginning of period | 397,664 | 683,287
Cash and cash equivalents at end of period | 414,155 | 486,195
Supplemental disclosures of cash flow information: |  |
Interest paid | 594 | 601
Income taxes paid | 2 | 3
Supplemental disclosures of non-cash investing and financing activities: |  |
Amounts accrued for capital and patent expenditures | $ 1,876 | $ 4,903

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