Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Summary of Fair Value Measurements (Detail)

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Summary of Significant Accounting Policies - Summary of Fair Value Measurements (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Asset at Fair Value:    
Total Assets at Fair Value $ 9 $ 3
Liabilities at Fair Value    
Total Liabilities at Fair Value 363 4
Forward Purchase Contracts [Member]    
Asset at Fair Value:    
Forward purchase contracts 9 3
Liabilities at Fair Value    
Forward purchase contracts 363 4
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Asset at Fair Value:    
Total Assets at Fair Value 9 3
Liabilities at Fair Value    
Total Liabilities at Fair Value 363 4
Fair Value, Measurements, Recurring [Member] | Forward Purchase Contracts [Member] | Level 2 [Member]    
Asset at Fair Value:    
Forward purchase contracts 9 3
Liabilities at Fair Value    
Forward purchase contracts $ 363 $ 4