Annual report pursuant to Section 13 and 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Reconciliation of Cash and Cash Equivalents and Restricted Cash (Details)

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Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Reconciliation of Cash and Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]      
Cash and cash equivalents $ 125,298 $ 22,020 $ 11,593
Restricted cash 15 15 275
Total cash, cash equivalents and restricted cash shown in the statements of cash flows $ 125,313 $ 22,035 $ 11,868