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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Current assets    
Cash and cash equivalents $ 9,820 $ 5,889
Short-term investments 8,213  
Accounts receivable, net 749 701
Inventories 1,153 599
Prepaid expenses and other 694 668
Total current assets 20,629 7,857
Long-term investments 3,203  
Property and equipment, net 89 121
Right-of-use lease asset, net 155 303
Other 18 17
Total assets 24,094 8,298
Current liabilities    
Accounts payable 144 76
Accrued expenses and other 1,562 1,300
Deferred revenue 162 15
Short-term lease liability 163 201
PPP note payable, current   244
Total current liabilities 2,031 1,836
Convertible notes payable   3,092
PPP note payable   335
Long-term lease liability   103
Total liabilities 2,031 5,366
Commitments and contingencies (Note 5)
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; 8,686 shares and 3,554 shares issued and outstanding at September 30, 2021 and December 31, 2020, respectively 9 3
Additional paid-in capital 268,967 245,548
Accumulated other comprehensive loss (6)  
Accumulated deficit (246,907) (242,619)
Total stockholders’ equity 22,063 2,932
Total liabilities and stockholders’ equity $ 24,094 $ 8,298