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Stock and Stock-based Compensation - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Feb. 28, 2017	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	May 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock issued to ESPP, shares			8,142	5,668
Additional compensation cost that will be recognized in future periods		$ 930	$ 930
Director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock units reserved for issuance in lieu of retainer fee			31,000	29,400
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		100.00%	100.00%
Convert to common stock		25.00%	25.00%
Increment period for awards converted into common stock			4 years
Stock compensation expense			$ 490	$ 460
Weighted average period additional compensation cost will be expensed			2 years
Granted restricted stock unit			31,327	231,356
Restricted Stock Units (RSUs) | Subsequent Event
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted restricted stock unit	395,000
Restricted Stock Units (RSUs) | Award Subject to 2017 Performance Measures | Subsequent Event
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted restricted stock unit	332,000
Restricted Stock Units (RSUs) | Two Thousand Seven Employee Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for issuance under the plan					1,700,000
Restricted Stock Units (RSUs) | Two Thousand Sixteen Employee Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage		75.00%
Board of Directors Compensation | Director | General and Administrative Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense			$ 150	$ 180

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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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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 share-based awards, other than options, awarded to employees as compensation.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Number of shares issued during the period as a result of an employee stock purchase plan.

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