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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Cash flows from operating activities: |  |  |
Net loss from operations | $ (14,434) | $ (30,584) | $ (5,455)
Adjustments to reconcile net loss from operations to net cash provided by (used in) operations: |  |  |
Depreciation and amortization of intangible assets | 7,066 | 8,926 | 12,003
Impairment of intangible assets | 3,828 | 0 | 0
Gains on sale of equity-method investment | (14,810) | 0 | 0
Deferred tax benefit | 1,637 | 2,823 | (1,487)
Stock-based compensation | 8,642 | 4,354 | 4,740
Allowance for doubtful accounts | 184 | (2,705) | 1,611
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (9,705) | 2,047 | 5,181
Inventories, net | (2,168) | 2,209 | 6,725
Contract assets | 52 | 3,787 | (191)
Accounts payable | 9,261 | 2,716 | (5,237)
Income taxes payable | (1,140) | (2,525) | (5,642)
Accrued expenses | 2,197 | 3,089 | (3,124)
Deferred compensation | (504) | (725) | 574
Deferred revenue | 8,173 | 9,713 | 8,342
Other assets and liabilities | (4,065) | (5,870) | (3,118)
Net cash (used in) provided by operating activities | (5,786) | (2,745) | 14,922
Cash flows from investing activities: |  |  |
Purchase of short-term investments | (15,812) | (59,925) | (34,060)
Maturities of short-term investments | 48,550 | 51,149 | 32,630
Additions to property and equipment | (4,996) | (2,169) | (3,101)
Additions to intangible assets | (29) | (35) | (133)
Sale of equity-method investment | 18,874 | 0 | 0
Net cash provided by (used in) investing activities | 46,587 | (10,980) | (4,664)
Cash flows from financing activities: |  |  |
Repurchase of common stock | (5,721) | (7,471) | (5,030)
Tax payments for restricted stock issuances | (1,587) | (2,923) | (2,030)
Net cash used in financing activities | (7,308) | (10,394) | (7,060)
Effect of exchange rate changes on cash | (372) | (895) | 914
Net increase (decrease) in cash | 33,121 | (25,014) | 4,112
Cash, cash equivalents, and restricted cash, beginning of period | 64,227 | 89,241 | 85,129
Cash, cash equivalents, and restricted cash, end of period | 97,348 | 64,227 | 89,241
Supplemental cash flow disclosures: |  |  |
Cash paid for income taxes | 2,025 | 7,700 | 9,442
Cash paid for interest | 0 | 0 | 0
Restricted cash | $ 800 | $ 800 | $ 900

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