Balance Sheet Details (Other receivables) (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Balance Sheet Details
Tenant improvement allowance receivable (Note 12)	$ 7,272,000	$ 6,595,000
Awards receivable	1,225,000	1,936,000
Other receivables	$ 8,497,000	$ 8,531,000

Amount, after allowance, of receivables classified as other, due within one year or the operating cycle, if longer.

No definition available.

Name:	us-gaap_OtherReceivablesNetCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant