Employee Stock Purchase Plan (Details) - Employee Stock Purchase Plan [Member] - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum Employee Subscription Rate	15.00%
Maximum Number of Shares Per Employee	2,500
Maximum Employee Subscription Value	$ 25
Purchase Price of Common Stock, Percent	85.00%
Issuance of common stock under Employee Stock Purchase Plan (Shares)	252,665	297,013
Proceeds, Issuance of Shares, Share-based Payment Arrangement, Excluding Option Exercised	$ 1,300	$ 947