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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 9 Months Ended
--- | ---
Sep. 28, 2019 | Sep. 29, 2018
Cash flows from operating activities: |  |
Net (loss) income | $ (22,062,298) | $ (24,526,756)
Adjustments to reconcile net (loss) income to net cash provided by operating activities: |  |
Depreciation and amortization | 597,091 | 1,688,715
Stock-based compensation | 1,805,999 | 3,878,619
Foreign currency (gains) losses | 32,483 | 269,239
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) | (56,997) | (333,889)
Unrealized gain on investments | (768,000) | (2,849,816)
Deferred income taxes | 78,777 | 70,803
Loss on disposal of plant and equipment | 487,284 | 0
Goodwill, Impairment Loss | 331,344 |
Write-off of excess inventory | 2,682,397 | 0
Other non-cash items | 94,444 | 519,027
Changes in assets and liabilities, net of acquired assets and liabilities: |  |
Accounts receivable | (1,786,687) | 1,504,218
Contract assets | 2,043,724 | 1,619,875
Inventory | (1,338,233) | (1,551,859)
Prepaid expenses and other current assets | 436,575 | 144,421
Accounts payable and accrued expenses | (427,603) | (664,524)
Contract liabilities and billings in excess of revenue earned | 1,034,608 | 49,174
Net cash used in operating activities | (16,815,092) | (20,182,753)
Cash flows provided by investing activities: |  |
Other assets | (106,524) | (7,616)
Capital expenditures | (113,009) | (959,488)
Proceeds from sale of marketable debt securities | 5,954,139 | 21,858,785
Payments to Acquire Debt Securities, Available-for-sale | 0 | 4,910,630
Cash paid for equity investment | (2,500,000) | (1,000,000)
Net cash provided by investing activities | 3,234,606 | 14,981,051
Cash flows (used in) provided by financing activities: |  |
Sale of registered stock | 8,038,531 | 0
Settlements of restricted stock for tax withholding obligations | 7,128 | 11,403
Net cash provided by financing activities | 8,031,403 | (11,403)
Effect of exchange rate changes on cash | (19,565) | (268,074)
Net decrease in cash and cash equivalents | (5,568,648) | (5,481,179)
Cash and cash equivalents: |  |
Beginning of period | 14,326,347 | 24,848,227
End of period | 8,757,699 | 19,367,048
Supplemental disclosure of cash flow information: |  |
Income taxes paid | $ 0 | $ 1,300,000

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