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v3.21.1

Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |
Net income (loss) | $ 505 | $ (8,408)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization expense | 2,313 | 1,914
Amortization of right of use of assets | 563 | 561
Stock-based compensation expense | 63 | 217
Provision for doubtful accounts, net | 82 | (207)
Write-down of inventory to net realizable value | 1,517 | 891
Loss on disposal of assets |  | 34
Changes in operating assets and liabilities: |  |
Receivables | 192 | 1,511
Inventories | 1,155 | 3,565
Prepaid expenses and other assets | (417) | (4,148)
Accounts payable | 1,079 | (858)
Accrued liabilities | (865) | 627
Income taxes receivable | (7,087) | 368
Deferred product revenue | (50) | (110)
Operating lease liabilities | (570) | (557)
Other long-term liabilities | 538 | (56)
Net cash used in operating activities | (982) | (4,656)
Cash flows from investing activities: |  |
Capitalized patent defense costs | (6,728) | (5,086)
Purchase of property and equipment | (284) | (205)
Purchase of intangible assets | (205) | (76)
Proceeds from maturities and sales of marketable securities | 4,605 | 9,243
Purchase of marketable securities | (2,932) | (9,003)
Net cash used in investing activities | (5,544) | (5,127)
Cash flows from financing activities: |  |
Issuance of common stock | 4,764 |
Net proceeds from issuance of senior convertible notes |  | 2,654
Proceeds from Paycheck Protection Program loan | 1,499 |
Net proceeds from equity-based compensation programs | 14 | 23
Net cash provided by financing activities | 6,277 | 2,677
Effect of exchange rate changes on cash and cash equivalents | (12) | (41)
Net increase (decrease) in cash and cash equivalents | (261) | (7,147)
Cash and cash equivalents at the beginning of the year | 4,064 | 11,211
Cash and cash equivalents at the end of the year | 3,803 | 4,064
Supplemental disclosure of cash flow information: |  |
Cash paid for income taxes | 79 | 1
Interest paid | $ 244 |

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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=121586364&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + 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=121586364&loc=d3e3255-108585 + 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=121586364&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=120381028&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=121586364&loc=d3e3255-108585 + Details
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- Definition The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured 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 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&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 expense (reversal of expense) for expected credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(5)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + 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=121586364&loc=d3e3602-108585 + Details
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