Summary of Significant Accounting Policies - Schedule of Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Cash and cash equivalents	$ 21,518	$ 26,394
Restricted cash	462	462
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows	$ 21,980	$ 26,856	$ 19,078	$ 16,842