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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities: |  |  |
Net income (loss) from operations | $ 8,789 | $ 3,846 | $ (22,399)
Adjustments to reconcile net income (loss) from operations to net cash provided by (used in) operations: |  |  |
Depreciation, amortization, and impairment of intangible assets | 11,545 | 12,138 | 10,601
Loss (gain) on disposal of assets | 69 | (49) | 185
Deferred tax expense (benefit) | (1,624) | (7,431) | 13,053
Stock-based compensation | 3,368 | 3,973 | 3,466
Changes in operating assets and liabilities: |  |  |
Accounts receivable, net | (3,414) | (11,960) | (8,428)
Inventories, net | (5,391) | (2,388) | 5,380
Contract assets | 655 | (3,110) |
Accounts payable | 3,628 | (1,475) | (1,013)
Income taxes payable | 318 | (2,541) | 11,926
Accrued expenses | (1,286) | 2,211 | 2,514
Deferred compensation | (334) | (291) | (77)
Deferred revenue | 1,465 | 9,538 | 3,704
Other assets and liabilities | 456 | (1,235) | (1,285)
Net cash provided by operating activities | 18,244 | 1,226 | 17,627
Cash flows from investing activities: |  |  |
Purchase of short term investments | (33,839) | (22,820) | (178,658)
Maturities of short term investments | 31,399 | 80,000 | 195,000
Purchase of Dealflo, net of cash acquired |  | (53,065) |
Additions to property and equipment | (7,453) | (3,685) | (3,088)
Other |  | (236) | (456)
Net cash provided by (used in) investing activities | (9,893) | 194 | 12,798
Cash flows from financing activities: |  |  |
Tax payments for restricted stock issuances | (569) | (970) | (640)
Net cash used in financing activities | (569) | (970) | (640)
Effect of exchange rate changes on cash | (208) | (1,556) | (469)
Net increase (decrease) in cash | 7,574 | (1,106) | 29,316
Cash, cash equivalents, and restricted cash, beginning of period | 77,555 | 78,661 | 49,345
Cash, cash equivalents, and restricted cash, end of period | 85,129 | 77,555 | 78,661
Supplemental cash flow disclosures: |  |  |
Cash paid for income taxes | $ 7,839 | $ 10,884 | $ 6,427

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Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration