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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Current assets    
Cash and cash equivalents $ 13,475 $ 5,889
Short-term investments 6,091  
Accounts receivable, net 632 701
Inventories 1,026 599
Prepaid expenses and other 388 668
Total current assets 21,612 7,857
Long-term investments 3,484  
Property and equipment, net 96 121
Right-of-use lease asset, net 205 303
Other 17 17
Total assets 25,414 8,298
Current liabilities    
Accounts payable 89 76
Accrued expenses and other 1,350 1,300
Deferred revenue 147 15
Short-term lease liability 201 201
PPP note payable, current   244
Total current liabilities 1,787 1,836
Convertible notes payable   3,092
PPP note payable   335
Long-term lease liability 10 103
Total liabilities 1,797 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; 8,660 shares and 3,554 shares issued and outstanding at June 30, 2021 and December 31, 2020, respectively 8 3
Additional paid-in capital 268,806 245,548
Accumulated other comprehensive loss (4)  
Accumulated deficit (245,193) (242,619)
Total stockholders’ equity 23,617 2,932
Total liabilities and stockholders’ equity $ 25,414 $ 8,298