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Summary of Significant Accounting Policies - Difference Between Federal Statutory Rate and Effective Tax Rate (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Tax at statutory rate	21.00%	35.00%	21.00%	35.00%
Tax effect of:
Valuation allowance on deferred tax assets	(24.10%)	(42.10%)	(24.30%)	(40.10%)
State income taxes, net of federal benefit	3.90%	5.00%	3.50%	4.30%
Nondeductible stock-based compensation	(0.40%)	(0.40%)	(0.70%)	(1.40%)
Effective tax rate	0.40%	(2.50%)	(0.50%)	(2.20%)

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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