Summary of Significant Accounting Policies - Summary of reconciliation of shares used to determine net loss per share (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Summary of Significant Accounting Policies
Net loss	$ (1,076)	$ (2,885)
Weighted average number of shares - basic	43,353,213	42,628,560
Weighted average number of shares outstanding - Diluted	43,353,213	42,628,560