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SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Estimated useful lives of property and equipment The estimated useful lives are typically as follows:
Computer equipment and purchased software3 years
Machinery and equipment3-5 years
Furniture and fixtures5 years
Property and equipment, net are as follows (in thousands):
December 31,
20202019
Computer equipment and purchased software$2,548 $3,011 
Machinery and equipment423 699 
Furniture and fixtures1,104 1,115 
Leasehold improvements 1
3,892 3,897 
Total7,967 8,722 
Less accumulated depreciation and amortization 1
(7,758)(7,496)
Property and equipment, net$209 $1,226 
1 In the fourth quarter 2019, we announced our decision to exit the San Jose California facility (“SJ Facility”) by March 31, 2020. We accelerated the amortization of our SJ Facility leasehold improvements over the remaining estimated life to March 31, 2020. As of December 31, 2019, the net book value of the SJ Facility leasehold improvements was $0.9 million and it was fully amortized by March 31, 2020.
Advertising expense Advertising expense was as follows (in thousands):
 Year ended December 31,
 20202019
Advertising expense$180 $173