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Investments and Fair Value Measurements - Investment Category and Length (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
May 31, 2023
USD ($)
Jan. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
company
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
company
May 31, 2022
USD ($)
Apr. 30, 2022
USD ($)
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]                    
Fair value, in loss position less than twelve months               $ 2,118,000    
Gross unrealized (loss), in loss position less than twelve months               (42,000)    
Fair value, in loss position greater than twelve months     $ 4,270,000     $ 4,270,000   8,988,000    
Gross unrealized (loss), in loss position greater than twelve months     (50,000)     (50,000)   (261,000)    
Fair value, total in loss position     4,270,000     4,270,000   11,106,000    
Gross unrealized (loss), total in loss position     (50,000)     (50,000)   (303,000)    
Restricted Cash                    
Proceeds from bank loans           42,197,000 $ 42,352,000      
Restricted cash     10,778,000     10,778,000   6,400,000    
Minority Investments                    
Investments, equity method     13,201,000     $ 13,201,000   $ 14,607,000    
Number of equity method investments | company           4   5    
Proceeds from sale of equity method investments           $ 827,000        
Investment, cost method     551,000     551,000        
Bank Of Beijing                    
Restricted Cash                    
Maximum borrowing capacity                 $ 3,400,000  
Bank Of Beijing | Secured debt                    
Restricted Cash                    
Time deposit               $ 2,500,000 $ 1,000,000.0 $ 2,900,000
Proceeds from bank loans   $ 2,300,000                
June 2023 bank loan two | Secured debt                    
Restricted Cash                    
Time deposit     3,900,000     3,900,000        
Proceeds from bank loans           3,500,000        
June 2023 bank loan one | Secured debt                    
Restricted Cash                    
Time deposit     $ 1,500,000     1,500,000        
Proceeds from bank loans           $ 1,400,000        
Bank Of China | Secured debt                    
Restricted Cash                    
Time deposit   3,000,000.0                
Proceeds from bank loans   $ 2,900,000                
Emeishan Jia Mei High Purity Metals Co., Ltd Investment                    
Minority Investments                    
Investments, equity method               418,000    
Ownership (as a percent) 25.00%   10.00%     10.00%        
Proceeds from sale of equity method investments $ 827,000                  
Investment, cost method     $ 551,000     $ 551,000        
Equity ownership percentage 10.00%   10.00%     10.00%        
Gain from share sale $ 575,000         $ 575,000        
Beijing JiYa Semiconductor Material Co., Ltd Investment                    
Minority Investments                    
Investments, equity method     $ 4,004,000     4,004,000   6,381,000    
Impairment charge on equity investee       $ 754,000            
Equity investment carrying value of asset after write down     $ 0     $ 0        
Ownership (as a percent)     39.00%     39.00%        
Investments Excluding Beijing JiYa Semiconductor Material Co., Ltd.                    
Minority Investments                    
Impairment charge on equity investee     $ 0   $ 0 $ 0 $ 0      
Certificates of deposit.                    
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]                    
Fair value, in loss position less than twelve months               2,118,000    
Gross unrealized (loss), in loss position less than twelve months               (42,000)    
Fair value, in loss position greater than twelve months     4,270,000     4,270,000   4,146,000    
Gross unrealized (loss), in loss position greater than twelve months     (50,000)     (50,000)   (133,000)    
Fair value, total in loss position     4,270,000     4,270,000   6,264,000    
Gross unrealized (loss), total in loss position     (50,000)     (50,000)   (175,000)    
Corporate bonds                    
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]                    
Fair value, in loss position greater than twelve months               4,842,000    
Gross unrealized (loss), in loss position greater than twelve months               (128,000)    
Fair value, total in loss position               4,842,000    
Gross unrealized (loss), total in loss position               (128,000)    
Other assets                    
Minority Investments                    
Investments, equity method     13,200,000     13,200,000   $ 14,600,000    
Other noncurrent assets | Emeishan Jia Mei High Purity Metals Co., Ltd Investment                    
Minority Investments                    
Investment, cost method     $ 551,000     $ 551,000