Common Stock (Reserved Share of Common Stock for Issuance) (Details) - shares	Jun. 30, 2022	Dec. 31, 2021
Class Of Stock [Line Items]
Options issued and outstanding	20,339,861	21,387,909
Options [Member]
Class Of Stock [Line Items]
Options issued and outstanding	20,639,861	21,387,909
Options available for future grants	6,328,932	7,209,538
Warrants issued and outstanding to purchase shares of common stock	1,928,020	1,928,020
Reserved Shares of Common Stock	28,896,813	30,525,467