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Nature of Business and Basis of Presentation - Additional Information (Detail)
 9 Months Ended
Sep. 30, 2021
USD ($)
Segment
Dec. 31, 2020
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Number of operating segments | Segment 1  
Total assets $ 1,035,805,000 $ 966,021,000
Cash and liquid short-term and long-term investments 517,900,000  
Total current assets 963,033,000 879,233,000
Cash and cash equivalents 222,875,000 186,964,000
Short-term investments 256,267,000 313,969,000
Accounts receivable, net 149,361,000 154,574,000
Inventory 309,268,000 188,864,000
Long-term investments 38,802,000 $ 62,469,000
Debt outstanding $ 0