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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Cash flows from operating activities: |  |  |  |  |
Net income (loss) | $ 11,166 | $ (9,140) | $ 8,553 | $ (15,679) |
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |  |  |
Stock-based compensation |  |  | 13,799 | 12,779 |
Depreciation |  |  | 12,753 | 15,447 |
Amortization of intangible assets | 4,700 | 4,600 | 9,284 | 9,276 |
Non-cash interest expense and amortization of convertible debt issuance costs |  |  | 3,775 | 3,571 |
Deferred income taxes |  |  | 1,317 | 53 |
Loss on equity investment |  |  | 453 | 318 |
Loss on disposal of property, plant and equipment |  |  | 0 | 2 |
Change in fair value of earn-out liability | 0 | 0 | 0 | (1,800) |
Change in operating assets and liabilities, net of impact of acquisitions: |  |  |  |  |
Accounts receivable |  |  | (10,827) | 8,841 |
Unbilled receivables |  |  | 51,463 | 79,842 |
Prepaid expenses and other assets |  |  | 4,688 | 1,726 |
Inventories |  |  | 6,414 | (1,468) |
Accounts payable |  |  | 1,715 | 1,709 |
Accrued salaries and benefits and other liabilities |  |  | (3,575) | (2,030) |
Income taxes payable |  |  | (9,747) | (8,643) |
Deferred revenue |  |  | 2,190 | (1,106) |
Operating lease liabilities |  |  | (1,203) | (3,565) |
Net cash provided by operating activities |  |  | 91,052 | 99,273 |
Cash flows from investing activities: |  |  |  |  |
Purchases of property, plant, and equipment |  |  | (5,267) | (12,780) |
Purchases of marketable securities |  |  | (333,782) | (487,521) |
Maturities of marketable securities |  |  | 260,924 | 407,556 |
Proceeds from sale of marketable securities |  |  | 174,546 | 2,496 |
Settlement of working capital adjustment from disposal of business |  |  | 0 | (1,131) |
Net cash provided by (used in) investing activities |  |  | 96,421 | (91,380) | $ (97,600)
Cash flows from financing activities: |  |  |  |  |
Proceeds received from issuance of common stock under employee stock plans |  |  | 4,186 | 7,880 |
Payments of taxes on restricted stock units |  |  | (8,486) | (7,663) |
Payments under installment payment arrangements |  |  | (7,168) | (6,600) |
Repurchase and retirement of common stock, including prepayment under accelerated share repurchase program |  |  | (100,068) | 0 |
Net cash used in financing activities |  |  | (111,536) | (6,383) |
Effect of exchange rate changes on cash and cash equivalents |  |  | (168) | (419) |
Net increase in cash, cash equivalents and restricted cash |  |  | 75,769 | 1,091 |
Cash, cash equivalents and restricted cash at beginning of period |  |  | 129,324 | 102,518 | 102,518
Cash, cash equivalents and restricted cash at end of period | $ 205,093 | $ 103,609 | 205,093 | 103,609 | $ 129,324
Non-cash investing and financing activities during the period: |  |  |  |  |
Property, plant and equipment received and accrued in accounts payable and other liabilities |  |  | $ 10,720 | $ 26,354 |

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- Definition Amount of cash outflow, made soon after acquisition date of business combination, to settle contingent consideration liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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