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)
6 Months Ended
Jun. 30, 2018
USD ($)
Fair Value Disclosures [Abstract]  
Transfers from Level 1 to Level 2 $ 0
Transfers from Level 2 to Level 1 0
Sale of available-for-sale securities $ 0