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Balance Sheet Components
 3 Months Ended
Mar. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Balance Sheet Components Balance Sheet Components
Inventory
As of March 31, 2023, inventory consisted of finished goods of $16.3 million and work-in-progress of $1.5 million. As of December 31, 2022, inventory consisted of finished goods of $15.6 million and work-in-progress and components of $1.7 million.
Property and Equipment, net:    
March 31, 2023December 31, 2022
 (in thousands)
Machinery and equipment
$17,070 $14,920 
Construction in progress
7,682 7,854 
Computer and office equipment
1,139 976 
Leasehold improvements
1,631 1,631 
Furniture and fixtures
390 390 
27,912 25,771 
Less: Accumulated depreciation and amortization
(11,283)(10,207)
$16,629 $15,564 
            
As of March 31, 2023, construction in progress pertains to the cost of individual components of a custom instrument set used for surgical placement of the Company's products that have not yet been placed into service of $4.0 million and construction costs related to the Company's lease for research and development and warehouse space in Santa Clara and software costs of $3.7 million. Depreciation expense was $1.1 million and $0.7 million for the three months ended March 31, 2023 and 2022, respectively.
Accrued Liabilities and Other:
March 31, 2023December 31, 2022
 (in thousands)
Accrued compensation and related expenses$7,487 $11,365 
Accrued royalty996 818 
    Accrued professional services 652 355 
Others761 973 
$9,896 $13,511 
Accounts Receivable and Allowance for Credit Losses:
The movement in the allowance for credit losses was as follows:
March 31, 2023December 31, 2022
 (in thousands)
Balance at beginning of period$400 $264 
Provision50 150 
Write-offs— (14)
Balance at end of period$450 $400