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Condensed Consolidated Statements of Cash Flows (Unaduited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows provided by (used in) operating activities:    
Net loss $ (284) $ (261)
Depreciation and amortization 16 27
Non-cash lease expense 29
Stock-based compensation 6 6
Change in operating assets and liabilities:    
Decrease (increase) in accounts receivable 434 (25)
Increase in inventory (18) (105)
Decrease in deferred charges 27 73
Decrease in other current assets and other assets 53 28
Decrease in accounts payable and accrued expenses (7) (69)
Decrease in deferred revenue (9) (10)
Decrease in operating lease liability (28)
Increase in other current liabilities and non-current liabilities 18 11
Net cash provided by (used in) operating activities 237 (325)
Cash flows used in investing activities:    
Purchases of software (87)
Payments made for patent filings (3)
Net cash used in investing activities (90)
Cash flows provided by financing activities:    
Short-term credit, net 3 140
Stock option exercise proceeds 19
Net cash provided by financing activities 22 140
Net increase (decrease)in cash, cash equivalents and restricted cash 169 (185)
Cash, cash equivalents and restricted cash at the beginning of the year 1,247 1,263
Cash, cash equivalents and restricted cash at the end of the period 1,416 1,078
Cash, cash equivalents and restricted cash consist of the following: End of period    
Cash and cash equivalents 1,416 779
Restricted cash 299
Cash and cash equivalents End of period 1,416 1,078
Cash, cash equivalents and restricted cash consist of the following: Beginning of period    
Cash and cash equivalents 1,247 973
Restricted cash 290
Cash and cash equivalents Beginning of period 1,247 1,263
Cash paid during the year for:    
Interest 7 1
Non-cash investing and financing activities:    
Purchase of equipment under installment agreement 7
Accrued preferred dividends to former Acorn director and/or former Omnimetrix CEO $ 1 $ 20