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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Current assets    
Cash and cash equivalents $ 5,640 $ 6,053
Short-term investments   300
Accounts receivable 539 1,175
Inventories 1,105 968
Prepaid expenses and other 567 472
Total current assets 7,851 8,968
Property and equipment, net 162 197
Right-of-use lease asset 109 156
Other 18 78
Total assets 8,140 9,399
Current liabilities    
Accounts payable 107 218
Deferred revenue 122 166
Short-term lease liability 116 166
Accrued expenses and other 1,325 1,155
Total current liabilities 1,670 1,705
Convertible notes payable 2,970 2,858
Total liabilities 4,640 4,563
Commitments and contingencies (Note 4)
Stockholders’ equity    
Preferred stock, $0.01 par value; 20,000 shares authorized; none issued and outstanding
Common stock, $0.001 par value; 120,000 shares authorized; 2,315 shares and 2,179 shares issued and outstanding at March 31, 2020 and December 31, 2019, respectively 2 2
Additional paid-in capital 243,350 243,281
Accumulated deficit (239,852) (238,447)
Total stockholders’ equity 3,500 4,836
Total liabilities and stockholders’ equity $ 8,140 $ 9,399