Condensed consolidated financial statement details - Other Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
POP Displays	$ 1,798,000	$ 2,509,000
Deposits and other	8,435,000	8,238,000
Other long-term assets	289,293,000	285,239,000
Amortization of intangible assets	100,000	1,200,000	$ 4,600,000
Amortization	2,100,000	2,800,000	4,200,000
Intangible Assets, Net (Excluding Goodwill)	15,000	62,000
Deferred Income Tax Assets, Net	279,040,000	$ 274,430,000	$ 274,430,000
Deferred Tax Assets, Tax Deferred Expense	$ 279,045,000