Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019		Mar. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Cash and cash equivalents	$ 67,326	$ 57,937	[1]
Restricted cash	203	203	[1]
Cash, cash equivalents and restricted cash	$ 67,529	$ 58,140		$ 68,702	$ 71,267

[1] The Condensed Consolidated Balance Sheet as of December 31, 2019 has been derived from the audited financial statements as of that date.