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Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Current assets:    
Cash and cash equivalents $ 517,000 $ 5,358,000
Accounts receivable, net of allowance for doubtful accounts of $14 and $9 at June 30, 2019 and December 31, 2018 204,000 274,000
Inventory 5,000 141,000
Short-term investments
Prepaid expenses and other current assets 426,000 445,000
Total current assets 1,152,000 6,218,000
Property and equipment, net 218,000 145,000
Operating lease right-of-use asset, net 1,292,000
Other assets 54,000 54,000
Total assets 2,716,000 6,417,000
Current liabilities:    
Accounts payable 1,626,000 1,020,000
Accrued expenses and other current liabilities 1,952,000 1,528,000
Operating lease liability - current 488,000
Total current liabilities 4,066,000 2,548,000
Operating lease liability - noncurrent 886,000
Deferred rent 77,000
Total liabilities 4,952,000 2,625,000
Stockholders’ equity:    
Preferred stock, $0.001 par value, 25,000,000 shares authorized as of June 30, 2019 and December 31, 2018; no shares issued and outstanding as of June 30, 2019 and December 31, 2018
Common stock, $0.001 par value, 100,000,000 shares authorized as of June 30, 2019 and December 31, 2018; 4,847,471 and 4,845,697 shares issued and outstanding as of June 30, 2019 and December 31, 2018 44,000 43,000
Additional paid-in capital 91,496,000 90,110,000
Accumulated deficit (93,776,000) (86,361,000)
Total stockholders’ (deficit) equity (2,236,000) 3,792,000
Total liabilities and stockholders’ equity $ 2,716,000 $ 6,417,000