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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cash flows from operating activities: |  |  |
Net loss from operations | $ (29,799) | $ (14,434) | $ (30,584)
Adjustments to reconcile net loss from operations to net cash used in operations: |  |  |
Depreciation and amortization of intangible assets | 6,479 | 7,066 | 8,926
Loss on disposal of asset | 455 | 0 | 0
Write-off of property and equipment, net | 2,728 | 3,828 | 0
Impairment of inventories, net | 143 | 0 | 0
Gain on sale of equity-method investment | 0 | (14,810) | 0
Deferred tax benefit | 118 | 1,637 | 2,823
Stock-based compensation | 14,252 | 8,642 | 4,354
Allowance for doubtful accounts | (65) | 184 | (2,705)
Changes in operating assets and liabilities: |  |  |
Accounts receivable | 1,571 | (9,705) | 2,047
Inventories, net | (3,275) | (2,168) | 2,209
Contract assets | (574) | 52 | 3,787
Accounts payable | (253) | 9,261 | 2,716
Income taxes payable | (2,367) | (1,140) | (2,525)
Accrued expenses | (1,531) | 2,197 | 3,089
Deferred compensation | 9 | (504) | (725)
Deferred revenue | 2,015 | 8,173 | 9,713
Other assets and liabilities | (641) | (4,038) | (5,870)
Net cash used in operating activities | (10,735) | (5,759) | (2,745)
Cash flows from investing activities: |  |  |
Purchase of short-term investments | 0 | (15,812) | (59,925)
Maturities of short-term investments | 2,330 | 48,550 | 51,149
Additions to property and equipment | (12,484) | (4,996) | (2,169)
Additions to intangible assets | (59) | (29) | (35)
Cash paid for acquisition of business | (1,800) | 0 | 0
Sale of equity-method investment | 0 | 18,874 | 0
Net cash provided by (used in) investing activities | (12,013) | 46,587 | (10,980)
Cash flows from financing activities: |  |  |
Repurchase of common stock | (29,155) | (5,721) | (7,471)
Tax payments for restricted stock issuances | (2,939) | (1,587) | (2,923)
Net cash used in financing activities | (32,094) | (7,308) | (10,394)
Effect of exchange rate changes on cash | 997 | (372) | (895)
Net (decrease) increase in cash | (53,845) | 33,148 | (25,014)
Cash, cash equivalents, and restricted cash, beginning of period | 97,375 | 64,227 | 89,241
Cash, cash equivalents, and restricted cash, end of period | 43,530 | 97,375 | 64,227
Supplemental cash flow disclosures: |  |  |
Cash paid for income taxes | 4,989 | 2,025 | 7,700
Cash paid for interest | $ 0 | $ 0 | $ 0

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