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Income Taxes - Additional Information (Detail)
 3 Months Ended
Mar. 31, 2018
USD ($)
Income Taxes [Line Items]  
Net deferred tax asset $ 0
Income tax expense 0
Dividend from subsidiaries $ 1,700,000
Estimated annual effective tax rate 25.951%
Effective tax rate 0.00%
Federal [Member]  
Income Taxes [Line Items]  
Net operating loss carryforwards $ 1,100,000
Net operating loss carryforwards subject to expiration $ 162,700,000
Net operating loss carryforwards expiration year 2025
Net operating loss carryforwards expiration year 2037
Foreign [Member]  
Income Taxes [Line Items]  
Net operating loss carryforwards $ 1,800,000
Net operating loss carryforwards subject to expiration $ 33,500,000