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Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Amortized cost of short-term marketable securities	$ 564,036	$ 479,791
Amortized cost of long-term marketable securities	$ 118,429	$ 105,263
Preferred stock par value	$ 0.0001	$ 0.0001
Preferred stock authorized	10,000,000	10,000,000
Preferred stock issued	0	0
Preferred stock outstanding	0	0
Common stock par value	$ 0.0001	$ 0.0001
Common stock authorized	340,000,000	340,000,000
Common stock issued	137,646,896	125,238,142
Common stock outstanding	137,646,896	125,238,142

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Face amount or stated value per share of common stock.

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