Summary of Significant Accounting Policies - Computation of Earnings (Loss) per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Basic earnings (loss) per share computation:
Net loss attributable to common stockholders —basic and diluted	$ (80,344)	$ (510)	$ (14,332)	$ (26,836)	$ (5,298)	$ (7,113)	$ (3,989)	$ (8,724)	$ (122,022)	$ (25,124)
Weighted average common shares - basic and diluted (in shares)									8,319,388	5,383,914
Basic and diluted loss per share (in dollars per share)									$ (14.67)	$ (4.67)