Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Additional Information (Details)

v3.19.3
Fair Value Measurements - Additional Information (Details) - Measurement Input, Interest Rate [Member] - Level 3 [Member]
Sep. 30, 2019
Dec. 31, 2018
Minimum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Investments, measurement input 0.01 0.01
Maximum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Investments, measurement input 0.04 0.04