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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Cash flows from operating activities: |  |  |
Net income (loss) |  | $ (3,699) | $ 3,280
Adjustments to reconcile net income (loss) from operations to net cash provided by (used in) operations: |  |  |
Depreciation and amortization of intangible assets |  | 9,193 | 8,579
Loss on disposal of assets |  | 75 |
Deferred tax benefit |  | (356) | (508)
Stock-based compensation |  | 3,232 | 1,778
Changes in operating assets and liabilities: |  |  |
Accounts receivable, net |  | 8,589 | (18,988)
Inventories, net |  | 5,790 | (4,549)
Contract assets |  | (379) | 540
Accounts payable |  | (5,551) | 5,895
Income taxes payable |  | (5,985) | (2,742)
Accrued expenses |  | (3,694) | (2,351)
Deferred compensation |  | 322 | (47)
Deferred revenue |  | 3,268 | (2,318)
Other assets and liabilities |  | (3,376) | (2,231)
Net cash used in operating activities |  | 7,429 | (13,662)
Cash flows from investing activities: |  |  |
Purchase of short term investments |  | (23,295) | (24,663)
Maturities of short term investments |  | 21,980 | 21,250
Additions to property and equipment |  | (2,710) | (4,196)
Other |  | (98) |
Net cash used in investing activities |  | (4,123) | (7,609)
Cash flows from financing activities: |  |  |
Tax payments for restricted stock issuances |  | (1,963) | (394)
Net cash used in financing activities |  | (1,963) | (394)
Effect of exchange rate changes on cash |  | 306 | (154)
Net increase (decrease) in cash |  | 1,649 | (21,819)
Cash, cash equivalents, and restricted cash, beginning of period |  | 85,129 | 77,555
Cash, cash equivalents, and restricted cash, end of period | [1] | $ 86,778 | $ 55,736
[1] | The following table provides a reconciliation of cash, cash equivalents and restricted cash shown above to amounts reported within the unaudited condensed consolidated balance sheet as of September 30, 2020 and December 31, 2019 and amounts previously reported within the unaudited condensed consolidated balance sheet in our Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2019 (in thousands):

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