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Stock and Stock-based Compensation - Additional Information (Detail)	1 Months Ended	12 Months Ended
	Feb. 29, 2016 shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($) shares	May. 31, 2014 shares	Dec. 31, 2013 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock issued to ESPP, shares		5,668	3,640
Additional compensation cost that will be recognized in future periods | $		$ 2,100,000
Stock options issued		0	0
Stock options outstanding		0	0		16,944
Unrecognized compensation cost related to stock option | $		$ 0
Director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock units reserved for issuance in lieu of retainer fee		36,200	18,000
Minimum | Director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of retainer fee to acquire common stock		50.00%
Maximum | Director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of retainer fee to acquire common stock		100.00%
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Conversion of stock RSU to Common, ratio		1
Convert to common stock		25.00%
Increment period for awards converted into common stock		4 years
Weighted average period additional compensation cost will be expensed		3 years
Granted restricted stock unit		231,356	160,000
Restricted Stock Units (RSUs) | Subsequent Event
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted restricted stock unit	343,000
Restricted Stock Units (RSUs) | Award Subject to 2016 Performance Measures | Subsequent Event
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted restricted stock unit	275,000
Restricted Stock Units (RSUs) | General and Administrative Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense | $		$ 460,000	$ 680,000
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense | $		0	0
Board of Directors Compensation | General and Administrative Expense | Director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense | $		$ 178,000	$ 130,000
Two Thousand Seven Employee Stock Incentive Plan | Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for issuance under the plan				1,700,000

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Number of options outstanding, including both vested and non-vested options.

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