Quarterly report pursuant to Section 13 or 15(d)

Trust Account and Fair Value Measurement (Details)

v3.8.0.1
Trust Account and Fair Value Measurement (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Assets:    
Carrying value $ 301,480,000 $ 300,403,000
Gross Unrealized Holding Loss 50,000  
Cash and money market [Member]    
Assets:    
Carrying value 157,000  
Gross Unrealized Holding Loss  
U.S. government treasury bills [Member]    
Assets:    
Carrying value 301,323,000 300,403,000
Gross Unrealized Holding Loss 50,000 18,000
Quoted Price Prices in Active Markets (Level 1) [Member]    
Assets:    
Gross Unrealized Holding Loss 301,430,000  
Quoted Price Prices in Active Markets (Level 1) [Member] | Cash and money market [Member]    
Assets:    
Carrying value 157,000  
Quoted Price Prices in Active Markets (Level 1) [Member] | U.S. government treasury bills [Member]    
Assets:    
Carrying value $ 301,273,000 $ 300,421,000