Income Taxes - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	May 31, 2013	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 30, 2016
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 (benefit) provision		$ 94,000	$ (154,000)	$ 183,000	$ 87,000
Deferred tax assets		0		0			$ 0
Deferred tax liabilities		$ 0		$ 0			$ 0
Common stock, shares issued	25,875,000			543	550
Net operating losses carried forward						$ 159,000,000
NOLs expiration date				Dec. 31, 2029
Internal Revenue Service [Member]
Tax Credit Carryforward [Line Items]
Net operating losses limitations				The availability of our net operating losses, or NOLs, is generally limited to $2.0 million per annum
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				2016