Significant Accounting Policies, Basic and Diluted Net Loss per Share (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Basic and Diluted Net Loss per Share [Abstract]
Basic net loss per share (in dollars per share)	$ (0.74)	$ (0.57)	$ (1.20)	$ (1.21)
0 Percent Convertible Senior Notes [Member]
Basic and Diluted Net Loss per Share [Abstract]
Interest rate on convertible senior notes	0.00%	0.00%	0.00%	0.00%	0.00%
0.125 Percent Convertible Senior Notes [Member]
Basic and Diluted Net Loss per Share [Abstract]
Interest rate on convertible senior notes	0.125%	0.125%	0.125%	0.125%	0.125%
1 Percent Convertible Senior Notes [Member]
Basic and Diluted Net Loss per Share [Abstract]
Interest rate on convertible senior notes	1.00%	1.00%	1.00%	1.00%