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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities: |  |  |
Net income (loss) from operations | $ 3,846 | $ (22,399) | $ 10,514
Adjustments to reconcile net income (loss) from operations to net cash provided by (used in) operations: |  |  |
Depreciation, amortization, and impairment of intangible assets | 12,138 | 10,601 | 10,777
Loss (gain) on disposal of assets | (49) | 185 | 14
Deferred tax expense (benefit) | (7,431) | 13,053 | (4,936)
Stock-based compensation | 3,973 | 3,466 | 2,766
Accounts receivable, net | (11,960) | (8,428) | (8,106)
Inventories, net | (2,388) | 5,380 | 3,198
Contract assets | (3,110) |  |
Accounts payable | (1,475) | (1,013) | 163
Income taxes payable | (2,541) | 11,926 | (582)
Accrued expenses | 2,211 | 2,514 | 4
Deferred compensation | (291) | (77) | 226
Deferred revenue | 9,538 | 3,704 | 14,396
Other assets and liabilities | (1,235) | (1,285) | (19)
Net cash provided by operating activities | 1,226 | 17,627 | 28,415
Cash flows from investing activities: |  |  |
Purchase of short term investments | (22,820) | (178,658) | (184,690)
Maturities of short term investments | 80,000 | 195,000 | 134,775
Purchase of Dealflo, net of cash acquired | (53,065) |  |
Additions to property and equipment | (3,685) | (3,088) | (2,043)
Other | (236) | (456) | (4,538)
Net cash provided by (used in) investing activities | 194 | 12,798 | (56,496)
Cash flows from financing activities: |  |  |
Tax payments for restricted stock issuances | (970) | (640) | (1,051)
Net cash used in financing activities | (970) | (640) | (1,051)
Effect of exchange rate changes on cash | (1,556) | (469) | (45)
Net increase (decrease) in cash | (1,106) | 29,316 | (29,177)
Cash, cash equivalents, and restricted cash, beginning of period | 78,661 | 49,345 | 78,522
Cash, cash equivalents, and restricted cash, end of period | 77,555 | 78,661 | 49,345
Supplemental cash flow disclosures: |  |  |
Cash paid for income taxes | $ 10,884 | $ 6,427 | $ 5,982

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