Stockholders' Equity - Additional Information (Detail) - shares	6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Class of Stock [Line Items]
Shares of common stock, authorized (in shares)	600,000,000
Shares of common stock, issued and sold (in shares)	198,100,000
Stock issued during period, shares, new issues (in shares)	1,800,000	2,300,000
2022 convertible senior notes
Class of Stock [Line Items]
Number of shares to be issued upon exercise of the Warrants (in shares)	500,000		2,300,000