Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Additional Information (Detail)

v3.19.1
Fair Value Measurements - Additional Information (Detail)
Mar. 31, 2019
USD ($)
Fair Value Disclosures [Abstract]  
Transfers from Level 1 to Level 2 $ 0
Transfers from Level 2 to Level 1 $ 0