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Cash and Marketable Securities - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Accounting Policies [Abstract]        
Cash and cash equivalents $ 169,222 $ 140,418 $ 59,406 $ 49,826
Restricted cash included in Restricted cash, current portion 2,000 0 0 0
Restricted cash included in Non-current restricted cash 1,500 3,500 3,500 3,500
Cash, cash equivalents and restricted cash as reported within the accompanying Condensed Consolidated Statements of Cash Flows 172,722 $ 143,918 $ 62,906 $ 53,326
Letter of credit established as a deposit $ 3,500