Annual report pursuant to Section 13 and 15(d)

Trust Account and Fair Value Measurement (Details)

v3.19.1
Trust Account and Fair Value Measurement (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Assets:    
Carrying value $ 304,035,000 $ 300,403,000
Gross Unrealized Holding Gain (Loss) (7,000)  
Cash and money market [Member]    
Assets:    
Carrying value 1,000  
Gross Unrealized Holding Gain (Loss)  
U.S. government treasury bills [Member]    
Assets:    
Carrying value 304,034,000 300,403,000
Gross Unrealized Holding Gain (Loss) (7,000) 18,000
Quoted Price Prices in Active Markets (Level 1) [Member]    
Assets:    
Carrying value 304,028,000  
Quoted Price Prices in Active Markets (Level 1) [Member] | Cash and money market [Member]    
Assets:    
Carrying value 1,000  
Quoted Price Prices in Active Markets (Level 1) [Member] | U.S. government treasury bills [Member]    
Assets:    
Carrying value $ 304,027,000 $ 300,421,000