Income Taxes - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 USD ($)
Income Taxes [Line Items]
Net operating loss carryforwards	$ 2,900,000
Unrecognized tax benefit that would affect the effective tax rate	1,700,000
Uncertain tax positions, interest expense and penalties accrued	200,000
Minimum [Member]
Income Taxes [Line Items]
Decrease in unrecognized tax benefits, net of penalties and interest	0
Maximum [Member]
Income Taxes [Line Items]
Decrease in unrecognized tax benefits, net of penalties and interest	$ 1,600,000