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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Cash flows from operating activities: |  |
Net income (loss) | $ (118) | $ 3,438
Adjustments to reconcile net income (loss) to net cash provided |  |
Depreciation, amortization, and impairment of intangible assets | 9,066 | 7,893
Loss (gain) on disposal of assets | (49) | 227
Deferred tax expense (benefit) | (3,020) | 73
Stock-based compensation | 2,916 | 1,901
Changes in assets and liabilities |  |
Accounts receivable, net | 6,183 | 3,854
Inventories, net | (3,267) | (97)
Contract assets | (2,892) |
Accounts payable | (5,258) | (2,808)
Income taxes payable | (8,433) | (2,089)
Accrued expenses | (911) | 2,096
Deferred compensation | (541) | (656)
Deferred revenue | (405) | 2,093
Other assets and liabilities | (2,476) | (876)
Net cash provided by (used in) operating activities | (9,205) | 15,049
Cash flows from investing activities: |  |
Purchase of short term investments |  | (168,731)
Maturities of short term investments | 80,000 | 155,000
Purchase of Dealflo, net of cash acquired | (53,065) |
Additions to property and equipment | (3,410) | (1,323)
Other |  | (462)
Net cash provided by (used in) investing activities | 23,525 | (15,516)
Cash flows from financing activities: |  |
Tax payments for restricted stock issuances | (399) | (257)
Net cash used in financing activities | (399) | (257)
Effect of exchange rate changes on cash | (647) | 640
Net increase (decrease) in cash | 13,274 | (84)
Cash and equivalents, beginning of period | 78,661 | 49,345
Cash and equivalents, end of period | $ 91,935 | $ 49,261

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