Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Recurring (Details)

v3.10.0.1
Fair Value Measurements - Recurring (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 31, 2018
Fair Value Measurements    
Restricted cash $ 6,000 $ 5,000
Recurring | Total    
Fair Value Measurements    
Restricted cash 6,000 5,000
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value Measurements    
Restricted cash $ 6,000 $ 5,000