Summary of Significant Accounting Policies - Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Level 3
Fair Value
Warrant liability		$ 33
Total liabilities measured at fair value		33
Recurring
Fair Value
Total assets measured at fair value	$ 14,144	12,367
Warrant liability	27	33
Total liabilities measured at fair value	27	33
Recurring | Level 1
Fair Value
Total assets measured at fair value	14,144	12,367
Recurring | Level 3
Fair Value
Warrant liability	27
Total liabilities measured at fair value	27
Recurring | Money market funds
Fair Value
Money market funds	14,144	12,367
Recurring | Money market funds | Level 1
Fair Value
Money market funds	$ 14,144	$ 12,367