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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Net Cash Provided by (Used in) Operating Activities [Abstract]    
Net income (loss) $ (8,155) $ 3,805
Adjustments to reconcile net income (loss) to net cash flows provided by operating activities:    
Depreciation and amortization 354 245
Amortization of beneficial conversion feature of convertible debts 0 50
Common stock issued for professional services 0 62
Stock-based compensation 4,216 1,396
Stock-based compensation associated with employment settlement 7,857  
Bad debt expense 32 2
Noncash lease expense 251  
Change in operating assets and liabilities:    
Accounts receivable (1,380) (1,081)
Notes receivable 0 17
Inventory (557) 1,200
Prepaid expenses and other (622) 14
Accounts payable and accrued expenses 1,461 (463)
Deferred rent 0 122
Net cash provided by operating activities 3,457 5,369
INVESTING ACTIVITIES    
Purchase of equipment (475) (190)
Tenant improvements to leasehold real estate (29) (87)
Net cash flows used in investing activities (504) (277)
FINANCING ACTIVITIES    
Repayment of convertible debt in cash 0 (660)
Repayment of unsecured debt in cash (405) (99)
Proceeds from exercise of stock options 254 107
Net cash flows used in financing activities (151) (652)
Net increase in cash, cash equivalents and restricted cash 2,802 4,440
Cash, cash equivalents and restricted cash, beginning of period 12,935 2,792
Cash, cash equivalents and restricted cash, end of period 15,737 7,232
Supplemental cash flow disclosures:    
Interest paid, net of interest income 9 120
Income taxes paid 54 18
Purchase of property and equipment in accounts payable and accrued expenses $ 50 $ 0

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