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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jul. 01, 2017
Cash flows from operating activities: |  |
Net loss | $ (14,718,777) | $ (15,200,417)
Adjustments to reconcile net (loss) income to net cash provided by operating activities: |  |
Depreciation and amortization | 1,130,169 | 1,142,506
Stock-based compensation | 2,687,789 | 1,968,128
Foreign currency losses | 19,534 | 656,613
Provision for Doubtful Accounts | 219,937 | 0
Unrealized gain on investments | (2,849,816) | (274,000)
Deferred income taxes | 196,252 | (1,169,940)
Other non-cash items | 301,499 | 608,672
Changes in assets and liabilities, net of acquired assets and liabilities: |  |
Accounts receivable | 687,986 | 241,213
Increase (Decrease) in Cost in Excess of Billing on Uncompleted Contract | 1,315,022 | 0
Inventory | (605,154) | (778,240)
Prepaid expenses and other current assets | 113,537 | (275,988)
Accounts payable and accrued expenses | (2,018,182) | 358,388
Billings in excess of revenue earned | 312,352 | 45,466
Net cash used in operating activities | (13,207,852) | (12,677,599)
Cash flows from investing activities: |  |
Other assets | (41,966) | (37,296)
Capital expenditures | (740,172) | (1,071,742)
Proceeds from sale of marketable debt securities | 13,109,285 | 24,322,300
Payments to Acquire Equity Method Investments | (1,000,000) | 0
Purchase of marketable debt securities | 0 | (16,812,114)
Cash paid for acquisition, net of cash acquired | 0 | (3,690,047)
Net cash provided by investing activities | 11,327,147 | 2,711,101
Cash flows from financing activities: |  |
Proceeds from Sale of Treasury Stock | 0 | 24,664,250
Payments Related to Tax Withholding for Share-based Compensation | 11,402 | 0
Net Cash Provided by (Used in) Financing Activities | (11,402) | 24,664,250
Effect of exchange rate changes on cash | (213,545) | 21,046
Net (decrease) increase in cash and cash equivalents | (2,105,652) | 14,718,798
Cash and equivalents: |  |
Beginning of period | 24,848,227 | 30,541,293
End of period | 22,742,575 |
Supplemental disclosure of cash flow information: |  |
Income taxes paid | $ 1,300,000 | $ 0

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