Summary of Significant Accounting Policies - Reconciliation of Weighted Average Shares Outstanding for the Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Basic and diluted earnings per share computations [Abstract]
Net loss	$ (36,562)	$ (15,571)	$ (24,122)
Basic:
Weighted average common shares (in shares)	19,014	16,223	16,041
Loss from per common share, basic (in dollars per share)	$ (1.92)	$ (0.96)	$ (1.50)
Diluted:
Weighted average common shares (in shares)	19,014	16,223	16,041
Loss per common share, diluted (in dollars per share)	$ (1.92)	$ (0.96)	$ (1.50)