Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Additional Information (Details)

v3.10.0.1
Fair Value Measurements - Additional Information (Details) - USD ($)
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract]    
Fair value assets transferred from level 1 to level 2 $ 0 $ 0
Fair value assets transferred from level 2 to level 1 0 0
Fair value liabilities transferred from level 1 to level 2 0 0
Fair value liabilities transferred from level 2 to level 1 0 0
Fair value assets transferred into level 3 0 0
Fair value assets transferred out of level 3 0 0
Fair value liabilities transferred into level 3 0 0
Fair value liabilities transferred out of level 3 $ 0 $ 0