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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Cash flows from operating activities: |  |  |
Net income (loss) from operations |  | $ 5,214 | $ (9,151)
Adjustments to reconcile net loss from operations to net cash provided by (used in) operations: |  |  |
Depreciation and amortization of intangible assets |  | 2,097 | 2,310
Loss on disposal of assets |  | 1 | 22
Gain on sale of equity-method investment |  | (14,810) |
Deferred tax benefit |  | 794 | (732)
Stock-based compensation |  | 1,360 | 1,342
Changes in operating assets and liabilities: |  |  |
Accounts receivable |  | 19,893 | 8,554
Allowance for doubtful accounts |  | 666 | 34
Inventories, net |  | (260) | 1,748
Contract assets |  | (904) | 2,346
Accounts payable |  | (941) | 140
Income taxes payable |  | (332) | (1,634)
Accrued expenses |  | (2,723) | 3,090
Deferred compensation |  | (797) | (1,527)
Deferred revenue |  | (5,156) | 322
Other assets and liabilities |  | (442) | (3,281)
Net cash provided by operating activities |  | 3,660 | 3,583
Cash flows from investing activities: |  |  |
Purchase of short term investments |  | (15,812) | (25,234)
Maturities of short term investments |  | 14,500 | 7,565
Additions to property and equipment |  | (272) | (755)
Additions to intangible assets |  | (7) | (16)
Sale of equity-method investment |  | (18,874) |
Net cash provided by (used in) investing activities |  | 17,283 | (18,440)
Cash flows from financing activities: |  |  |
Tax payments for restricted stock issuances |  | (635) | (2,139)
Net cash used in financing activities |  | (635) | (2,139)
Effect of exchange rate changes on cash |  | (45) | (558)
Net increase (decrease) in cash |  | 20,263 | (17,554)
Cash, cash equivalents, and restricted cash, beginning of period |  | 64,228 | 89,241
Cash, cash equivalents, and restricted cash, end of period | [1] | 84,491 | 71,687
Supplemental cash flow disclosures: |  |  |
Restricted Cash |  | $ 800 | $ 900
[1] | End of period cash, cash equivalents, and restricted cash includes $0.8 million and $0.9 million of restricted cash at March 31, 2022 and March 31, 2021, respectively.

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