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Stockholders' Equity - Stock Incentive Plans - Additional Information (Detail) - USD ($)			1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
		May 02, 2018	Jul. 31, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option compensation (income) expense						$ (40,000)	$ 46,000	$ 50,000	$ 161,000	$ 349,000
Stock options granted	[1]							0	0	0
Additional compensation expense relating to stock options								$ 6,800
Restricted stock compensation (income) expense						(81,000)	64,000	79,000	$ 266,000	$ 308,000
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option compensation (income) expense				$ (47,000)	$ 24,000	(40,000)	46,000	$ 100,000	$ 200,000	300,000
Stock options granted									0
Remaining average recognition period for unrecognized compensation expense								5 months 1 day
Aggregate intrinsic value of options outstanding and exercisable								$ 0
Closing stock price (in dollars per share)								$ 450.00
Stock Options [Member] | Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options granted, term								10 years
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock compensation (income) expense				$ (94,000)	$ 6,000	$ (81,000)	$ 100,000	$ 100,000	$ 300,000	$ 300,000
2004 Stock Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved for the issuance (in shares)								0
2009 Stock Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved for the issuance (in shares)			0					0
Increased number of shares (in shares)			0
Shares available for grant								0
Subsequent Event [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for grant		0
Stock options granted		0
[1] Due to the May 2, 2018 1-for-500 reverse stock split, and no fractional shares being issued, all numbers are reduced to zero.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested options awarded to employees as compensation.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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