Basis of Presentation and Summary of Significant Accounting Policies (Details) - Schedule of investments - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Cash and Cash Equivalents	$ 4,097	$ 8,164
Short-term Investments	92,487	22,171
Investments (non-current)	55,716	2,825
Total	152,300	33,160
Fair Value, Inputs, Level 1 [Member]
Schedule of Investments [Line Items]
Cash and Cash Equivalents	4,097	8,164
Short-term Investments	27,722	12,892
Investments (non-current)	7,999
Total	39,818	21,056
Fair Value, Inputs, Level 1 [Member] \| Money Market Funds [Member]
Schedule of Investments [Line Items]
Cash and Cash Equivalents	4,097	2,165
Short-term Investments
Investments (non-current)
Total	4,097	2,165
Fair Value, Inputs, Level 1 [Member] \| U.S. Government Debt Securities [Member]
Schedule of Investments [Line Items]
Cash and Cash Equivalents		5,999
Short-term Investments	27,722	12,892
Investments (non-current)	7,999
Total	35,721	18,891
Fair Value, Inputs, Level 2 [Member
Schedule of Investments [Line Items]
Cash and Cash Equivalents
Short-term Investments	64,765	9,279
Investments (non-current)	47,717	2,825
Total	112,482	12,104
Fair Value, Inputs, Level 2 [Member \| Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Cash and Cash Equivalents
Short-term Investments	61,916	8,054
Investments (non-current)	47,717	2,825
Total	109,633	10,879
Fair Value, Inputs, Level 2 [Member \| Municipal debt securities [Member]
Schedule of Investments [Line Items]
Cash and Cash Equivalents
Short-term Investments	2,849	1,225
Investments (non-current)
Total	$ 2,849	$ 1,225

Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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