Fair Value Measurements - Assets and Liabilities at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Fair Value of Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total Assets	$ 27,993	$ 32,545
Cash
Fair Value of Assets and Liabilities Measured at Fair Value on a Recurring Basis
Cash and Money market funds	250	250
Money Market Funds [Member]
Fair Value of Assets and Liabilities Measured at Fair Value on a Recurring Basis
Cash and Money market funds	27,743	32,295
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member]
Fair Value of Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total Assets	27,993	32,545
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Cash
Fair Value of Assets and Liabilities Measured at Fair Value on a Recurring Basis
Cash and Money market funds	250	250
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Money Market Funds [Member]
Fair Value of Assets and Liabilities Measured at Fair Value on a Recurring Basis
Cash and Money market funds	$ 27,743	$ 32,295