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Balance Sheet Components
 12 Months Ended
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Balance Sheet Components Balance Sheet Components
Inventory
Inventories consist of the following (in thousands):
December 31,
2021
2020
Raw materials$2,232 $1,721 
Work-in-process879 1,487 
Finished goods4,711 3,701 
Total$7,822 $6,909 
Property and Equipment, net
Property and equipment, net consists of the following (in thousands):
December 31,
2021
2020
Machinery, equipment, furniture and fixtures$3,742 $3,544 
Computer equipment and software2,916 2,730 
Leasehold improvements2,402 2,402 
9,060 8,676 
Less: Accumulated depreciation(8,457)(8,161)
Property and equipment, net $603 $515 

Depreciation expense for the years ended December 31, 2021 and December 31, 2020 was $0.3 million and $0.3 million, respectively.
Accrued Liabilities
Accrued liabilities consist of the following (in thousands):
December 31,
2021
2020
Payroll and related expenses $6,547 $4,565 
Inventory-raw materials251 636 
Professional fees109 279 
Deferred rent, current490 666 
Other526 457 
$7,923 $6,603