Summary of Significant Accounting Policies - Summary of reconciliation of shares used to determine net income per share (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Summary of Significant Accounting Policies
Net loss	$ (5,208)	$ (25,940)
Weighted average number of shares - basic	42,710,381	42,613,478
Weighted average number of shares outstanding - Diluted	42,710,381	42,613,478