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Fair Value Measurements - Additional Information (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Fair Value Disclosures [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
Financial assets measured at fair value on a nonrecurring basis 0 0
Financial liabilities measured at fair value on a nonrecurring basis $ 0 $ 0