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Composition of Certain Balance Sheet Items
 9 Months Ended
Sep. 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):
September 30,December 31,
20202019
Machinery and equipment$9,343 $9,312 
Leasehold improvements1,261 1,261 
Purchased computer software1,444 1,308 
12,048 11,881 
Less: accumulated depreciation and amortization(9,149)(8,007)
Property and equipment, net$2,899 $3,874 

Depreciation expense was $0.4 million and $1.2 million for the three and nine months ended September 30, 2020, respectively, compared to $0.4 million and $1.2 million for the three and nine months ended September 30, 2019, respectively.
Other Current Liabilities
Other current liabilities consisted of the following (in thousands):
September 30,December 31,
20202019
Payroll and related expenses$4,467 $4,818 
Professional services547 400 
Other615 322 
Other current liabilities$5,629 $5,540