Income Taxes - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	May 31, 2013	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Tax Credit Carryforward [Line Items]
Annual distribution of net taxable income for U.S. federal income tax not to apply to our earnings that we distribute (percent)				90.00%
Net taxable income subject to distribution (percent)				100.00%
Excise tax rate				4.00%
Income tax provision		$ 194,000	$ 81,000	$ 281,000	$ 431,000
Deferred tax assets		0		0		$ 0
Deferred tax liabilities		0		$ 0		0
Common stock, shares issued	25,875,000			812	34,780,443
Net operating losses carried forward						159,000,000
Net capital losses carried forward						$ 602,000
NOLs expiration date				Dec. 31, 2029
Internal Revenue Service [Member]
Tax Credit Carryforward [Line Items]
Net operating losses and net capital losses		$ 2,000,000		$ 2,000,000
Earliest Tax Year [Member]
Tax Credit Carryforward [Line Items]
Open tax year				2013
Latest Tax Year [Member]
Tax Credit Carryforward [Line Items]
Open tax year				2015