Shareholders' Equity, Stock Plans and Preferred Stock - Schedule of Weighted Average Grant Date Fair Value and Total Intrinsic Value of Exercises (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Share-based Payment Arrangement [Abstract]
Weighted average grant date fair value (in dollars per share)	$ 0	$ 0
Total intrinsic value of exercises	$ 0	$ 3