Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
Net change in valuation allowance	$ 3,500,000
Net operating loss carryforwards	$ 113,200,000
Net operating loss carryforwards expiration date	Jun. 30, 2019
Built-in gain tax existed at the date of the ownership change	$ 42,000,000
Built-in gains triggered period	5 years
Built-in gains change in ownership period	5 years
Net operating losses	$ 42,000,000
Net operating losses available to offset future state taxable income expiration description	Between 2017 and 2036
Unrecognized tax benefits	$ 0	$ 0	$ 0
Interest and penalties related to unrecognized tax benefits	0	0	0
Expected amount of unrecognized tax benefits	0	$ 0	$ 0
Federal [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	$ 176,300,000
Net operating loss carryforwards expiration date	Dec. 31, 2036
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	$ 97,100,000