Investments and Fair Value Measurements - Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Assets, Fair Value Disclosure [Abstract]
Investments, amortized cost	$ 5,695	$ 5,695	$ 5,966
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]
Transfer from Level 1 to Level 2 , assets	0	0
Transfer from Level 2 to Level 1 , assets	0	0
Transfers into Level 3, assets	0	0
Transfer out of Level 3, assets		0
Recurring
Assets, Fair Value Disclosure [Abstract]
Total	14,982	14,982	5,966
Recurring | Certificates of Deposit [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents, fair value disclosure	11,930	11,930	2,885
Recurring | Corporate Bonds [Member]
Assets, Fair Value Disclosure [Abstract]
Investments, amortized cost	3,052	3,052	3,081
Recurring | Significant Other Observable Inputs (Level 2)
Assets, Fair Value Disclosure [Abstract]
Total	14,982	14,982	5,966
Recurring | Significant Other Observable Inputs (Level 2) | Certificates of Deposit [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents, fair value disclosure	11,930	11,930	2,885
Recurring | Significant Other Observable Inputs (Level 2) | Corporate Bonds [Member]
Assets, Fair Value Disclosure [Abstract]
Investments, amortized cost	$ 3,052	$ 3,052	$ 3,081