Nature of Business and Basis of Presentation - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020 USD ($) Segment	Dec. 31, 2019 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of operating segments | Segment	1
Total assets	$ 966,021,000	$ 882,209,000
Cash and liquid short-term and long-term investments	563,400,000
Total current assets	879,233,000	855,005,000
Cash and cash equivalents	186,964,000	644,588,000
Short-term investments	313,969,000
Accounts receivable, net	154,574,000	116,430,000
Inventory	188,864,000	$ 76,769,000
Long-term investments	62,469,000
Debt outstanding	$ 0