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Income Taxes - Additional Information (Detail)
 6 Months Ended
Jun. 30, 2019
USD ($)
Income Taxes [Line Items]  
Net deferred tax asset $ 0
Income tax expense 0
Valuation allowance, net operating loss $ 3,900,000
Estimated Annual Effective Tax Rate 45.889%
Effective tax rate 0.00%
Federal [Member]  
Income Taxes [Line Items]  
Net operating loss carryforwards subject to expiration $ 170,100,000
Net operating loss carryforwards expiration year 2025
Net operating loss carryforwards expiration year 2037
Net operating loss carryforwards $ 2,700,000
Foreign [Member]  
Income Taxes [Line Items]  
Net operating loss carryforwards subject to expiration 43,800,000
Net operating loss carryforwards $ 1,200,000