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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Cash flows from operating activities: |  |
Net income | $ 9,815 | $ 8,053
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 6,390 | 4,213
Non-cash interest expense | 2,691 | 1,107
Stock-based compensation expense | 4,165 | 3,251
Deferred tax expense |  | 892
Other | 140 |
Changes in operating assets and liabilities, excluding impact of acquisitions: |  |
Accounts receivable | (2,399) | (6,692)
Royalties and other receivables | 148 | 112
Unbilled receivables |  | 2,602
Inventories | (7,191) | (1,478)
Prepaid expenses and other assets | 36 | 215
Operating lease right of use assets | 919 | 784
Accounts payable | (709) | (570)
Accrued expenses | (4,989) | (1,855)
Operating lease liability | 334 | (840)
Long-term liabilities | 180 | (6)
Total cash provided by operating activities | 9,530 | 9,788
Cash flows from investing activities: |  |
Additions to capitalized software costs | (911) | (1,740)
Purchases of property, plant and equipment | (4,126) | (2,088)
Total cash used in investing activities | (5,037) | (3,828)
Cash flows from financing activities: |  |
Exercise of stock options | 1,599 | 44
Payment of tax withholding obligation on vesting of restricted stock | (10) |
Total cash provided by financing activities | 1,589 | 44
Effect of exchange rate changes on cash, cash equivalents and restricted cash | (4,923) | (3,691)
Net increase in cash, cash equivalents and restricted cash | 1,159 | 2,313
Cash, cash equivalents and restricted cash, beginning of period | 537,407 | 193,822
Cash, cash equivalents and restricted cash, end of period | 538,566 | 196,135
Supplemental disclosure of cash flow information: |  |
Income taxes paid | 1,756 | $ 1,055
Interest paid | 527 |
Supplemental disclosure of non-cash investing and financing activities: |  |
Assets acquired under operating leases | $ 17 |

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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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Name: | us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration