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Composition of Certain Balance Sheet Items
 6 Months Ended
Jun. 30, 2020
Composition of Certain Balance Sheet Items [Abstract]  
Composition of Certain Balance Sheet Items Composition of Certain Balance Sheet Items
Property and Equipment, net
Property and equipment, net consisted of the following (in thousands):
June 30,December 31,
20202019
Machinery and equipment$9,334  $9,312  
Leasehold improvements1,261  1,261  
Purchased computer software1,392  1,308  
11,987  11,881  
Less: accumulated depreciation and amortization(8,772) (8,007) 
Property and equipment, net$3,215  $3,874  

Depreciation expense was $0.4 million and $0.8 million for the three and six months ended June 30, 2020, respectively, compared to $0.4 million and $0.8 million for the three and six months ended June 30, 2019, respectively.
Other Current Liabilities
Other current liabilities consisted of the following (in thousands):
June 30,December 31,
20202019
Payroll and related expenses$3,355  $4,818  
Professional services715  400  
Other673  322  
Other current liabilities$4,743  $5,540