Fair Value Measurements (Details 1) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Fair Value
Cash and Cash Equivalents	$ 89,887	$ 126,263
Short-term Investments	28,614	26,012
Total Cash and Cash Equivalents and Investments	118,501	152,275
Fair Value, Level 1
Fair Value
Cash and Cash Equivalents	89,887	126,263
Short-term Investments	15,183	0
Total Cash and Cash Equivalents and Investments	105,070	126,263
Fair Value, Level 2
Fair Value
Cash and Cash Equivalents	0	0
Short-term Investments	13,431	26,012
Total Cash and Cash Equivalents and Investments	13,431	26,012
Fair Value, Level 3
Fair Value
Cash and Cash Equivalents	0	0
Short-term Investments	0	0
Total Cash and Cash Equivalents and Investments	$ 0	$ 0