Investments (Details) - Schedule of financial assets measured at fair value on a recurring basis - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Available-for-sale securities — current:
Total	$ 17,886	$ 17,884
Level 1 [Member]
Available-for-sale securities — current:
Total	3,137	3,136
Level 2 [Member]
Available-for-sale securities — current:
Total	14,749	14,748
Level 3 [Member]
Available-for-sale securities — current:
Total
Money market funds [Member]
Cash equivalents:
Cash equivalents	3,137	3,136
Money market funds [Member] | Level 1 [Member]
Cash equivalents:
Cash equivalents	3,137	3,136
Money market funds [Member] | Level 2 [Member]
Cash equivalents:
Cash equivalents
Money market funds [Member] | Level 3 [Member]
Cash equivalents:
Cash equivalents
U.S. Treasury securities [Member]
Available-for-sale securities — current:
Available-for-sale securities - current	14,749	14,748
U.S. Treasury securities [Member] | Level 1 [Member]
Available-for-sale securities — current:
Available-for-sale securities - current
U.S. Treasury securities [Member] | Level 2 [Member]
Available-for-sale securities — current:
Available-for-sale securities - current	14,749	14,748
U.S. Treasury securities [Member] | Level 3 [Member]
Available-for-sale securities — current:
Available-for-sale securities - current