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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Net income | $ 61,338 | $ 37,729 | $ 30,518
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 53,559 | 51,350 | 51,511
Loss on disposal of property and equipment | 445 | 133 | 512
Share-based compensation expense | 34,049 | 28,885 | 21,857
Income tax benefits from employee stock plans | 0 | 0 | 11
Deferred income taxes | (1,339) | (5,705) | (31,365)
Amortization of operating lease right-of-use assets | 10,562 | 0 | 0
Amortization of debt issuance costs | 2,204 | 2,292 | 1,590
Changes in operating assets and liabilities: |  |  |
Accounts receivable and unbilled receivables | (21,540) | (6,192) | (40,598)
Inventories | (8,123) | (6,763) | (26,840)
Prepaid expenses | 2,909 | (308) | (4,920)
Other current assets | (2,010) | 1,170 | (2,074)
Investment in sales-type leases | (3,699) | (1,680) | 6,625
Prepaid commissions | (2,719) | (4,711) | (3,966)
Other long-term assets | 4,528 | (7,077) | (1,373)
Accounts payable | 7,893 | (9,154) | 19,709
Accrued compensation | 2,495 | 14,419 | 519
Accrued liabilities | 3,045 | 8,223 | 4,383
Deferred revenues | 5,445 | 3,020 | (2,334)
Operating lease liabilities | (10,040) | 0 | 0
Other long-term liabilities | 6,006 | (1,665) | 1,069
Net cash provided by operating activities | 145,008 | 103,966 | 24,834
Investing Activities |  |  |
Purchase of intangible assets, intellectual property, and patents | 0 | 0 | (160)
Software development for external use | (45,770) | (30,677) | (15,040)
Purchases of property and equipment | (15,894) | (23,697) | (15,341)
Business acquisitions, net of cash acquired | 0 | 0 | (4,446)
Net cash used in investing activities | (61,664) | (54,374) | (34,987)
Financing Activities |  |  |
Proceeds from Issuance of Debt | 0 | 0 | 59,000
Repayment of debt and revolving credit facility | (90,000) | (77,000) | (102,500)
Payments for debt issuance costs | (2,321) | 0 | (2,106)
Payment for contingent consideration | 0 | 0 | (2,400)
At the market offering, net of offering costs | 37,806 | 39,567 | 13,900
Proceeds from issuances under stock-based compensation plans | 40,706 | 30,611 | 30,121
Employees’ taxes paid related to restricted stock units | (9,670) | (6,775) | (5,892)
Net cash used in financing activities | (23,479) | (13,597) | (9,877)
Effect of exchange rate changes on cash and cash equivalents | 153 | (1,227) | (2,034)
Net increase (decrease) in cash and cash equivalents | 60,018 | 34,768 | (22,064)
Cash and cash equivalents at beginning of period | 67,192 | 32,424 | 54,488
Cash and cash equivalents at end of period | 127,210 | 67,192 | 32,424
Supplemental cash flow information |  |  |
Cash paid for interest | 3,582 | 7,487 | 6,550
Cash paid for taxes, net of refunds | 7,761 | 3,489 | 7,780
Supplemental disclosure of non-cash activities |  |  |
Non-cash activity business acquisition | 0 | 0 | 3,400
Unpaid purchases of property and equipment | 913 | 1,123 | 1,691
Transfers between inventory and property and equipment, net | 1,552 | 2,032 | 0
Transfers from prepaid expenses to property and equipment | 3,313 | 0 | 0
Right-of-use assets obtained in exchange for new lease liabilities | 1,204 | 0 | 0
Balance transfer from term loan to revolving credit facility | $ 80,000 | $ 0 | $ 0

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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition The net book value of a nonmonetary asset transferred or exchanged in connection with the acquisition of a business or asset in a noncash transaction. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Nonmonetary assets and liabilities are assets and liabilities that will not result in cash receipts or cash payments in the future. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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