Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets and Liabilities Measured at Fair Value [Abstract]
Money market funds	$ 15	$ 435
Total assets	15	435
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Money market funds	15	435
Total assets	15	435
Significant Other Observable Inputs (Level 2) [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Money market funds	0	0
Total assets	0	0
Significant Unobservable Inputs (Level 3) [Member]
Assets and Liabilities Measured at Fair Value [Abstract]
Money market funds	0	0
Total assets	$ 0	$ 0