Summary of Significant Accounting Policies - Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value
Total assets measured at fair value	$ 12,367	$ 23,478
Warrant liability	33
Total liabilities measured at fair value	33
Level 1
Fair Value
Total assets measured at fair value	12,367	23,478
Level 3
Fair Value
Warrant liability	33
Total liabilities measured at fair value	33
Money market funds
Fair Value
Money market funds	12,367	23,478
Money market funds | Level 1
Fair Value
Money market funds	$ 12,367	$ 23,478