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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 12 Months Ended
--- | ---
Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Cash flows from operating activities: |  |  |
Net loss | $ (29,374,222) | $ (34,482,492) | $ (25,380,115)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation and amortization | 792,221 | 1,958,680 | 2,501,891
Accretion of premium or discount on marketable debt securities | 21,838 | 15,948 | 41,364
Stock-based compensation | 2,057,400 | 4,791,054 | 2,296,131
Net (gain)/loss on investment transactions | 3,858,453 | (2,849,816) | (2,000,000)
Income taxes | 105,036 | 4,185 | (2,421,040)
Foreign currency (gains) losses | (220,015) | (1,096,487) | 893,260
Loss on sale of property and plant | 508,833 | 51,159 | 0
Impairment of assets | 0 | 2,526,669 |
Impairment of goodwill | 331,344 | 1,417,470 | 600,086
Change in allowance for bad debt | 633,131 | (155,000) | 13,000
Inventory Write-down | 1,834,300 | 832,615 | 654,694
Change in warranty reserves | (62,107) | (79,633) | 142,328
Changes in assets and liabilities: |  |  |
Accounts receivable | (3,944,859) | 853,163 | (2,376,593)
Contract assets and unbilled receivables | 2,168,581 | 865,474 |
Inventory | (792,165) | (1,656,196) | (1,633,027)
Prepaid expenses, other current assets and other assets | 821,340 | 113,015 | (1,084,146)
Accounts payable and accrued expenses | (163,084) | (1,208,848) | 1,924,751
Billings in excess of revenue earned | 397,121 | (4,742) | (85,282)
Net cash used in operating activities | (21,026,854) | (28,103,782) | (25,912,698)
Cash flows from investing activities: |  |  |
Proceeds from sale of marketable debt securities | 7,454,139 | 26,646,078 | 37,536,004
Purchase of marketable debt securities | 0 | (5,697,329) | (19,633,903)
Cash paid for acquisition, net of cash acquired | 0 | 0 | (3,690,047)
Payments to Acquire Equity Method Investments | (2,500,000) | (1,000,000.0) |
Other assets | (41,031) | (8,373) | (140,860)
Capital expenditures | (170,186) | (1,183,131) | (2,794,467)
Net cash provided by investing activities | 4,742,922 | 18,757,245 | 11,276,727
Cash flows from financing activities: |  |  |
Sale of unregistered stock |  | 0 | 24,664,250
Settlements of restricted stock for tax withholding obligations | (45,513) | (208,015) | (771,323)
Distribution to noncontrolling interest holder | 0 | (699,105) | (791,737)
Net cash provided by (used in) financing activities | 7,993,016 | (907,120) | 23,101,190
Effect of exchange rate changes on cash | (6,184) | (268,223) | 560,513
Net (decrease) increase in cash and cash equivalents | (8,297,100) | (10,521,880) | 9,025,732
Cash and cash equivalents at beginning of year | 14,326,347 | 24,848,227 | 15,822,495
Cash and cash equivalents at end of year | 6,029,247 | 14,326,347 | 24,848,227
Supplemental disclosure of cash flow information: |  |  |
Income taxes paid | 0 | 1,374,000 | 281,000
Construction in progress included in accrued expenses | 0 | $ 0 | $ 212,000
Proceeds from Issuance of Common Stock | $ 8,038,529 |  |

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- Definition Amount of cash (inflow) outflow from investing activities classified as other. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 Reference 3: 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 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 purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + 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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