Income Taxes - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
Income Taxes [Line Items]
Net operating loss carry-forwards for federal and state	$ 48.6
Earliest Tax Year
Income Taxes [Line Items]
Tax year subject to examination	2013
Latest Tax Year
Income Taxes [Line Items]
Tax year subject to examination	2016
Net operating loss carry-forwards expire in 2034
Income Taxes [Line Items]
Net operating loss carry-forwards for federal and state	$ 11.5
Net Operating loss carry-forwards, expiration year	2034
Net operating loss carry-forwards expire in 2035
Income Taxes [Line Items]
Net operating loss carry-forwards for federal and state	$ 16.6
Net Operating loss carry-forwards, expiration year	2035
Net operating loss carry-forwards expire in 2036
Income Taxes [Line Items]
Net operating loss carry-forwards for federal and state	$ 19.6
Net Operating loss carry-forwards, expiration year	2036