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Income Taxes - Reconciliation of Statutory Federal Income Tax Rate and Effective Income Tax Rate (Detail)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Percent [Abstract]    
Statutory federal income tax rate 35.00% 35.00%
Permanent items (11.00%) 106.00%
State income taxes, net of federal taxes (7.00%) 17.00%
Foreign (3.00%) (17.00%)
Change in valuation allowance 175.00% (152.00%)
Change in tax rates (189.00%) 0.00%
Tax credits claimed (0.00%) 7.00%
Other 0.00% 4.00%
Effective income tax rate 0.00% 0.00%