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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows provided by (used in) operating activities:    
Net loss $ (403) $ (533)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 1,454 1,336
Provision for doubtful accounts 27 36
Amortization of operating lease right-of-use assets 144
Scrap expense 4 28
Transfer of fixed assets to sales-type lease 6 10
Stock-based compensation 109 251
Amortization of debt issuance costs 5 17
Loss from disposition of equipment and capitalized software 16 23
Changes in assets and liabilities:    
Accounts receivable 384 (108)
Site equipment to be installed 465 (111)
Operating lease liabilities (58)
Prepaid expenses and other assets 12 (176)
Accounts payable and accrued liabilities (20) 145
Income taxes (10) 14
Deferred costs 47 234
Deferred revenue (866) (848)
Deferred rent (99)
Other liabilities 23 20
Net cash provided by operating activities 1,339 239
Cash flows used in investing activities:    
Capital expenditures (79) (280)
Capitalized software development expenditures (639) (424)
Net cash used in investing activities (718) (704)
Cash flows (used in) provided by financing activities:    
Net proceeds from issuance of common stock related to registered direct offering 1,381
Principal payments on long-term debt (417) (364)
Principal payments on financing leases (30) (88)
Payment of preferred stockholders dividends (8) (8)
Tax withholding related to net share settlement of vested restricted stock units (13)
Net cash (used in) provided by financing activities (468) 921
Effect of exchange rate on cash and cash equivalents 39 (49)
Net increase in cash, cash equivalents and restricted cash 192 407
Cash, cash equivalents and restricted cash at beginning of period 2,786 3,378
Cash, cash equivalents and restricted cash at end of period 2,978 3,785
Supplemental disclosures of cash flow information: Cash paid during the period for:    
Interest 116 173
Income taxes 24 17
Supplemental disclosure of non-cash investing and financing activities:    
Initial measurement of operating lease right-of-use assets and liabilities 3,458
Site equipment transferred to fixed assets 381 1,151
Assets acquired under financing lease 5
Assets acquired under operating lease 53
Reconciliation of cash, cash equivalents and restricted cash at end of period:    
Cash and cash equivalents 2,727 3,785
Restricted cash 51
Restricted cash, long-term 200
Total cash, cash equivalents and restricted cash at end of period $ 2,978 $ 3,785