Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized gains or losses from events or changes in circumstances that affect the fair value of investments	$ 0	$ 0
Cash and cash equivalents	283,057	127,053
Other Investments	1,565	1,565
Total financial assets	284,622	128,618
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	283,057	127,053
Total financial assets	283,057	127,053
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Investments	1,565	1,565
Total financial assets	$ 1,565	$ 1,565