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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |
Net loss | $ (26,529) | $ (9,077)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Stock-based compensation | 7,853 | 6,649
Depreciation and amortization | 3,737 | 3,837
Amortization of acquired intangible assets | 1,496 | 1,504
Gain on loan extinguishment | (796) | 0
Reversal of uncertain tax positions | (88) | (124)
Deferred income tax expense | 26 | 45
Accretion on short-term marketable securities | (4) | (94)
Gain on sale of marketable securities | (4) | 0
Gain on sale of patents | 0 | (3,905)
Inventory step-up and backlog amortization | 0 | 12
Other | 9 | (3)
Changes in operating assets and liabilities: |  |
Accounts receivable, net | 6,243 | (3,933)
Inventories | 2,956 | (2,459)
Prepaid expenses and other current and long-term assets, net | 3,295 | 2,172
Accounts payable | 166 | (1,304)
Accrued current and long-term liabilities | (2,361) | (3,686)
Income taxes payable | 290 | (14)
Net cash used in operating activities | (3,711) | (10,380)
Cash flows from investing activities: |  |
Proceeds from sales and maturities of marketable securities | 8,229 | 10,050
Purchases of property and equipment | (2,637) | (2,629)
Purchases of available-for-sale marketable securities | (1,500) | (10,856)
Purchases of licensed technology | (152) | (521)
Proceeds from sale of patents | 0 | 4,250
Payment associated with sale of patents | 0 | (345)
Net cash used in (provided by) investing activities | 3,940 | (51)
Cash flows from financing activities: |  |
Net proceeds from equity offering | 12,743 | 0
Net proceeds from private placement investment | 6,210 | 0
Net proceeds from "at the market" equity offering | 4,429 | 0
Payments on asset financings | (1,007) | (826)
Proceeds from Paycheck Protection Program loan | 796 | 0
Proceeds from issuances of common stock under employee equity incentive plans | 600 | 570
Net cash provided by (used in) financing activities | 23,771 | (256)
Net increase (decrease) in cash and cash equivalents | 24,000 | (10,687)
Cash and cash equivalents, beginning of period | 7,257 | 17,944
Cash and cash equivalents, end of period | 31,257 | 7,257
Supplemental disclosure of cash flow information: |  |
Cash paid for income taxes, net of refunds received | 397 | 547
Cash paid during the year for interest | 217 | 142
Non-cash investing and financing activities: |  |
Gain on loan extinguishment | (796) | 0
Acquisitions of property and equipment and other assets under extended payment terms | $ 1,495 | $ 934

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- Definition The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26853-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition Amount of cash outflow for the purchase of or improvements to tangible or intangible assets, used to produce goods or deliver services, classified as other. + 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 inflow associated with the amount received from entity's raising of capital via private rather than public placement. + 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 Amount of cash inflow from issuance of shares under share-based payment arrangement. Includes, but is not limited to, option exercised. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116856206&loc=SL79508275-113901 Reference 2: 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 Amount of cash inflow from debt classified as other. + 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 (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. + References No definition available. + Details
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- Definition Amount of cash inflow from the sale of other assets recognized in investing activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition Amount of cash outflow for the payment of debt classified as other. + 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 noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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