Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Summary of Changes In Estimated Fair Value of Level 3 Financial Assets (Details)

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Fair Value Measurements - Summary of Changes In Estimated Fair Value of Level 3 Financial Assets (Details) - Level 3
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Fair value of long-term equity securities at contract inception $ 955
Change in fair value (563)
Balance at December 31, 2018 $ 392