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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Current assets    
Cash and cash equivalents $ 9,529 $ 5,889
Short-term investments 1,610  
Accounts receivable, net 375 701
Inventories 862 599
Prepaid expenses and other 534 668
Total current assets 12,910 7,857
Property and equipment, net 105 121
Right-of-use lease asset, net 254 303
Other 18 17
Total assets 13,287 8,298
Current liabilities    
Accounts payable 81 76
Deferred revenue 15 15
Short-term lease liability 201 201
PPP note payable, current 434 244
Accrued expenses and other 1,291 1,300
Total current liabilities 2,022 1,836
Convertible notes payable   3,092
PPP note payable 145 335
Long-term lease liability 57 103
Total liabilities 2,224 5,366
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; 6,134 shares and 3,554 shares issued and outstanding at March 31, 2021 and December 31, 2020, respectively 6 3
Additional paid-in capital 255,046 245,548
Accumulated other comprehensive loss (1)  
Accumulated deficit (243,988) (242,619)
Total stockholders’ equity 11,063 2,932
Total liabilities and stockholders’ equity $ 13,287 $ 8,298