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Balance Sheet Details
 3 Months Ended
Mar. 31, 2022
Balance Sheet Related Disclosures [Abstract]  
Balance Sheet Details Balance Sheet Details
Cash, Cash Equivalents and Restricted Cash
Cash, cash equivalents and restricted cash consisted of the following as of March 31, 2022 and December 31, 2021 (in thousands):
March 31, 2022December 31, 2021
Cash and cash equivalents$29,983 $28,451 
Restricted cash1,016 1,016 
Total cash, cash equivalents and restricted cash$30,999 $29,467 
Short-term restricted cash of approximately $16 thousand is included in prepaid expenses and other current assets and $1.0 million of non-current restricted cash is included in other non-current assets in the condensed consolidated balance sheet as of March 31, 2022 and December 31, 2021.
Inventories, net
Inventories, net consisted of the following as of March 31, 2022 and December 31, 2021 (in thousands):
March 31, 2022December 31, 2021
Raw materials$12,592 $9,345 
Work-in-process994 867 
Finished goods9,659 10,613 
Total inventories, net$23,245 $20,825 
Property and Equipment, net
Property and equipment, net consisted of the following as of March 31, 2022 and December 31, 2021 (in thousands):
March 31, 2022December 31, 2021
Computer equipment and software$5,777 $5,759 
Laboratory and manufacturing equipment33,884 30,260 
Leasehold improvements12,460 12,095 
Office furniture and fixtures2,065 2,074 
Property and equipment, gross54,186 50,188 
Less accumulated depreciation and amortization(28,151)(26,703)
Construction-in-progress1,664 4,549 
Property and equipment, net$27,699 $28,034 
 
The majority of the amounts included in construction-in-progress are related to the NIH Contract (see Note 4).
Accrued Compensation and Related Benefits
Accrued compensation and related benefits, which is included in current liabilities on the condensed consolidated balance sheet consisted of the following as of March 31, 2022 and December 31, 2021 (in thousands):
March 31, 2022December 31, 2021
Accrued incentive compensation$1,779 $14 
Accrued vacation3,737 3,388 
Accrued payroll taxes and other1,547 1,492 
Accrued severance and retention bonuses901 26 
Accrued compensation and related benefits$7,964 $4,920 
Long-term accrued severance and retention bonuses of approximately $0.6 million and $0.1 million are included in non-current other liabilities on our condensed consolidated balance sheet as of March 31, 2022 and December 31, 2021, respectively.
Warranties
Accrued warranty is included in other current liabilities on our condensed consolidated balance sheet. Activity for our warranty accrual for the three months ended March 31, 2022 and 2021 is summarized below (in thousands):
Three Months Ended March 31,
20222021
Beginning balance$1,170 $1,663 
Accrual (release) for current period warranties306 (150)
Warranty costs incurred(264)(236)
Ending balance$1,212 $1,277