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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Current assets    
Cash and cash equivalents $ 6,372 $ 7,104
Short-term investments 1,072  
Accounts receivable 1,355 1,622
Inventories 601 1,148
Prepaid expenses and other 944 923
Total current assets 10,344 10,797
Property and equipment, net 223 279
Goodwill 420 420
Right-of-use lease asset 250  
Other 260 260
Total assets 11,497 11,756
Current liabilities    
Accounts payable 88 236
Deferred revenue 103 273
Short-term lease liability 197  
Accrued expenses and other 1,114 1,402
Total current liabilities 1,502 1,911
Long-term liabilities 67 17
Convertible notes payable 2,749 2,671
Total liabilities 4,318 4,599
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; 43,233 shares and 42,967 shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively 43 43
Additional paid-in capital 243,095 242,981
Accumulated other comprehensive income 1  
Accumulated deficit (235,960) (235,867)
Total stockholders' equity 7,179 7,157
Total liabilities and stockholders' equity $ 11,497 $ 11,756