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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Cash flows from operating activities: |  |
Net income | $ 790 | $ 683
Adjustments to reconcile net income to net cash provided: |  |
Depreciation, amortization, and impairment of intangible assets | 6,020 | 5,258
Gain on disposal of assets | (49) |
Deferred tax benefit | (13) | (1,134)
Stock-based compensation | 1,809 | 1,076
Changes in assets and liabilities |  |
Accounts receivable, net | 7,181 | 9,560
Inventories, net | (2,414) | (255)
Contract assets | (4,282) |
Accounts payable | (2,195) | (748)
Income taxes payable | (5,946) | (2,740)
Accrued expenses | (347) | (435)
Deferred compensation | (1,069) | (906)
Deferred revenue | 3,468 | 1,682
Other assets and liabilities | (3,599) | (75)
Net cash provided by (used in) operating activities | (646) | 11,966
Cash flows from investing activities: |  |
Purchase of short term investments |  | (99,459)
Maturities of short term investments | 80,000 | 95,000
Purchase of Dealflo, net of cash acquired | (53,065) |
Additions to property and equipment | (3,016) | (716)
Other |  | (40)
Net cash provided by (used in) investing activities | 23,919 | (5,215)
Cash flows from financing activities: |  |
Tax payments for restricted stock issuances | (233) | (199)
Net cash used in financing activities | (233) | (199)
Effect of exchange rate changes on cash | (269) | 505
Net increase in cash | 22,771 | 7,057
Cash and equivalents, beginning of period | 78,661 | 49,345
Cash and equivalents, end of period | $ 101,432 | $ 56,402

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