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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Cash flows from operating activities: |  |  |
Net loss from operations |  | $ (15,836) | $ (2,021)
Adjustments to reconcile net loss from operations to net cash provided by (used in) operations: |  |  |
Depreciation and amortization of intangible assets |  | 4,582 | 6,097
Loss on disposal of assets |  | 19 | 53
Deferred tax benefit |  | (2,194) | (319)
Stock-based compensation |  | 2,634 | 2,210
Changes in operating assets and liabilities: |  |  |
Accounts receivable, net |  | 11,021 | 7,528
Inventories, net |  | 3,585 | 3,376
Contract assets |  | 1,974 | (2,026)
Accounts payable |  | 1,280 | (5,025)
Income taxes payable |  | (2,652) | (5,870)
Accrued expenses |  | 3,660 | (791)
Deferred compensation |  | (1,031) | 13
Deferred revenue |  | (931) | 2,990
Other assets and liabilities |  | (4,927) | (1,834)
Net cash provided by operating activities |  | 1,184 | 4,381
Cash flows from investing activities: |  |  |
Purchase of short term investments |  | (32,253) | (14,645)
Maturities of short term investments |  | 16,100 | 13,340
Additions to property and equipment |  | (1,208) | (2,167)
Other |  | (17) | (48)
Net cash used in investing activities |  | (17,378) | (3,520)
Cash flows from financing activities: |  |  |
Repurchase of common stock |  | (2,908) |
Tax payments for restricted stock issuances |  | (2,230) | (1,179)
Net cash used in financing activities |  | (5,138) | (1,179)
Effect of exchange rate changes on cash |  | (511) | 20
Net decrease in cash |  | (21,843) | (298)
Cash, cash equivalents, and restricted cash, beginning of period |  | 89,241 | 85,129
Cash, cash equivalents, and restricted cash, end of period | [1] | 67,398 | 84,831
Supplemental cash flow disclosures: |  |  |
Restricted Cash |  | $ 900 | $ 800
[1] | End of period cash, cash equivalents, and restricted cash includes $0.9 million and $0.8 million of restricted cash at June 30, 2021 and June 30, 2020, respectively.

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