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Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ 2,159 $ (1,722)
Reconciliation of Net Income (Loss) to Net Cash Provided by Operating Activities:    
Amortization of debt discount 16 80
Accretion of non-cash interest 135 44
Loss on extinguishment of debt   179
Depreciation 249 267
Loss on disposal of assets for lease 107 142
Allowance for doubtful accounts 20 5
Stock-based compensation expense 331 165
Changes in Operating Assets and Liabilities:    
Trade accounts receivable (535) (13)
Prepaid expenses and other current assets (105) (7)
Accounts payable (303) 96
Accrued expenses (570) 505
Deferred revenue 4 189
Net Cash Provided By (Used in) Operating Activities 1,508 (70)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Additions to property and equipment (105) (12)
Purchase of assets for lease (138) (591)
Net Cash Used in Investing Activities (243) (603)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of common stock   475
Exercise of warrants 64  
Exercise of stock options 245 78
Proceeds from loans payable   63
Payments of loans payable (1,022) (69)
Net Cash (Used in) Provided by Financing Activities (713) 547
INCREASE (DECREASE) IN CASH 552 (126)
CASH, BEGINNING OF PERIOD 1,457 622
CASH, END OF PERIOD 2,009 496
Cash paid for interest $ 191 7
Supplemental disclosure of noncash financing activity:    
Reclassification of accrued interest to debt upon extinguishment   162
Fair value of warrants issued to lenders   $ 288