Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended					12 Months Ended
	Oct. 31, 2020	Jan. 31, 2020	Jun. 30, 2019	Jan. 31, 2019	Jun. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jul. 02, 2020
Warrants - issued and outstanding
Stock issued in transaction (shares)	4,585,706	3,538,462	2,415,000	1,854,838
Sale price of common stock (USD per share)	$ 202.00	$ 97.50	$ 97.00	$ 62.00
Proceeds from sale of common stock	$ 879,600	$ 324,000	$ 219,900	$ 107,900
Common stock, par value (USD per share)						$ 0.001	$ 0.001		$ 0.001
Aggregate offering price									$ 200,000
Proceeds from disgorgement of shareholders' short-swing profits				$ 1,100		$ 41	$ 1,050	$ 0
Number of warrants exercised via cashless exercises (shares)						1,400,012	2,125,033	0
Net exercise of warrants (shares)						1,400,000	2,125,000
Exercise of warrants for cash (shares)						63,235
Warrant
Warrants - issued and outstanding
Stock issued in transaction (shares)					421,650
Sale price of common stock (USD per share)					$ 38.849