Nature of Business and Basis of Presentation - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2021 USD ($) Segment	Dec. 31, 2020 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of operating segments | Segment	1
Total assets	$ 990,252,000	$ 966,021,000
Cash and liquid short-term and long-term investments	538,700,000
Total current assets	930,516,000	879,233,000
Cash and cash equivalents	290,994,000	186,964,000
Short-term investments	223,742,000	313,969,000
Accounts receivable, net	151,275,000	154,574,000
Inventory	230,892,000	188,864,000
Long-term investments	24,004,000	$ 62,469,000
Debt outstanding	$ 0