Fair Value Measurements of Financial Instruments - Schedule of Financial Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financial assets - available-for-sale securities
Total financial assets - available-for-sale securities	$ 25,565	$ 25,487
Money Market Funds
Financial assets - available-for-sale securities
Total financial assets - available-for-sale securities	17,309	6,400
Corporate Bonds
Financial assets - available-for-sale securities
Total financial assets - available-for-sale securities	8,256	17,337
Commercial Paper
Financial assets - available-for-sale securities
Total financial assets - available-for-sale securities		1,750
Fair Value Measurements Recurring
Financial assets - available-for-sale securities
Total financial assets - available-for-sale securities	25,565	25,487
Fair Value Measurements Recurring | Money Market Funds
Financial assets - available-for-sale securities
Total financial assets - available-for-sale securities	17,309	6,400
Fair Value Measurements Recurring | Corporate Bonds
Financial assets - available-for-sale securities
Total financial assets - available-for-sale securities	8,256	17,337
Fair Value Measurements Recurring | Commercial Paper
Financial assets - available-for-sale securities
Total financial assets - available-for-sale securities		1,750
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets - available-for-sale securities
Total financial assets - available-for-sale securities	17,309	6,400
Fair Value Measurements Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money Market Funds
Financial assets - available-for-sale securities
Total financial assets - available-for-sale securities	17,309	6,400
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2)
Financial assets - available-for-sale securities
Total financial assets - available-for-sale securities	8,256	19,087
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Corporate Bonds
Financial assets - available-for-sale securities
Total financial assets - available-for-sale securities	$ 8,256	17,337
Fair Value Measurements Recurring | Significant Other Observable Inputs (Level 2) | Commercial Paper
Financial assets - available-for-sale securities
Total financial assets - available-for-sale securities		$ 1,750