Quarterly report pursuant to Section 13 or 15(d)

Trust Account and Fair Value Measurement (Details)

v3.10.0.1
Trust Account and Fair Value Measurement (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Assets:    
Carrying value $ 301,332,000 $ 300,403,000
Gross Unrealized Holding Gain 55,000  
Cash and money market [Member]    
Assets:    
Carrying value 2,000  
Gross Unrealized Holding Gain  
U.S. government treasury bills [Member]    
Assets:    
Carrying value 301,330,000 300,403,000
Gross Unrealized Holding Gain 55,000 18,000
Quoted Price Prices in Active Markets (Level 1) [Member]    
Assets:    
Gross Unrealized Holding Gain 301,387,000  
Quoted Price Prices in Active Markets (Level 1) [Member] | Cash and money market [Member]    
Assets:    
Carrying value 2,000  
Quoted Price Prices in Active Markets (Level 1) [Member] | U.S. government treasury bills [Member]    
Assets:    
Carrying value $ 301,385,000 $ 300,421,000