Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands						6 Months Ended		12 Months Ended
	Jun. 09, 2022	Nov. 12, 2021	May 18, 2021	May 14, 2021	May 04, 2020	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Jan. 29, 2020
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)						50,000,000		50,000,000
Preferred stock, par value (in dollars per share)						$ 0.001		$ 0.001
Preferred stock, undesignated shares authorized (in shares)						40,000,000
Common stock, shares authorized (in shares)						200,000,000		200,000,000
Common stock, par value (in dollars per share)						$ 0.001		$ 0.001
Common stock, shares issued (in shares)						110,586,000		94,152,000
Common stock, shares outstanding (in shares)						110,586,000		94,152,000
Payments of stock issuance costs						$ 15
Remaining shares authorized to be repurchased (in shares)						7,962,000		8,210,000
Common stock repurchased						$ 1,544	$ 0
Common Stock
Class of Stock [Line Items]
Common stock, shares outstanding (in shares)						110,586,000		94,152,000
Common stock repurchased (in shares)						248,000
Common stock repurchased						$ 1,544
At-The-Market Offering Program
Class of Stock [Line Items]
Commission rate				2.00%	2.00%
Common stock, par value (in dollars per share)				$ 0.001	$ 0.001
Number of shares issued in transaction (in shares)				17,000,000	17,000,000
Common stock, additional shares authorized (in shares)	28,800,000	25,000,000
2021 Common stock ATM Sales Agreement | Common Stock
Class of Stock [Line Items]
Number of shares issued in transaction (in shares)						16,587,000		17,915,000
Series C Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)						10,000,000
Preferred stock, par value (in dollars per share)						$ 0.001		$ 0.001
Preferred stock, dividend rate						7.00%		7.00%
Preferred stock, shares outstanding (in shares)						6,847,000		6,847,000
Preferred stock, shares issued (in shares)						6,847,000		6,847,000
Preferred stock, liquidation preference (in dollars per share)						$ 25.00		$ 25.00
Preferred stock, aggregate liquidation preference						$ 171,175		$ 171,175
Preferred stock, designated but unissued shares authorized (in shares)						3,153,000		3,153,000
Proceeds from issuance of preferred stock						$ 0	$ 36,585
Series C Preferred Stock | January 23, 2020 Underwriting Agreement
Class of Stock [Line Items]
Preferred stock, liquidation preference (in dollars per share)						$ 25.00		$ 25.00
Series C Preferred Stock | Preferred C ATM Sales Agreement
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)									6,550,000
Commission rate									2.00%
Series B Preferred Stock | February 15, 2019, Common Stock ATM Sales Agreement
Class of Stock [Line Items]
Number of shares issued in transaction (in shares)			10,713,000
Proceeds from issuance of preferred stock			$ 129,336
Payments of stock issuance costs			$ 1,682
Series B Preferred Stock | 2021 Common stock ATM Sales Agreement
Class of Stock [Line Items]
Payments of stock issuance costs						$ 1,458