Equity - Additional Information (Detail)	1 Months Ended		3 Months Ended		12 Months Ended
	Jan. 31, 2017 USD ($) $ / shares	Dec. 31, 2016 USD ($) Milestone $ / shares shares	Mar. 31, 2017 USD ($) Plan $ / shares shares	Mar. 31, 2016 USD ($)	Dec. 31, 2016 $ / shares shares	Jan. 01, 2017 shares
Stockholders Equity [Line Items]
Common stock, shares authorized		120,000,000	120,000,000		120,000,000
Common stock, par value | $ / shares		$ 0.01	$ 0.01		$ 0.01
Preferred stock, shares authorized		5,000,000	5,000,000		5,000,000
Preferred stock, par value | $ / shares		$ 0.001	$ 0.001		$ 0.001
Common stock voting rights description			one vote per share
Common stock, shares outstanding		26,986,318	26,986,318		26,986,318
Number of equity compensation plans | Plan			3
Stock-based compensation expense | $			$ 784,000	$ 486,000
Restricted Stock Units [Member]
Stockholders Equity [Line Items]
Vesting period	4 years
2014 Stock Option and Incentive Plan [Member]
Stockholders Equity [Line Items]
Number of shares reserved for future issuance			315,028			1,079,453
Percentage of outstanding common stock increased to shares available for grant					4.00%
Closing price of common stock | $ / shares			$ 2.00
Stock options, intrinsic value | $			$ 0
2014 Stock Option and Incentive Plan [Member] | Restricted Stock Units [Member]
Stockholders Equity [Line Items]
Number of shares granted by board			931,000
Number of common stock received for contingent right		1
Stock options, terms of vesting			Vesting for these RSU’s was based equally on the achievement of two performance-based conditions, subject to continued service through such achievement dates.
Number of vesting achievement of performance-based conditions | Milestone		2
Intrinsic fair value, date of grant | $		$ 3,055
Stock-based compensation expense | $		$ 0
Fair value of grants to be recognized due to change in vesting criteria | $	$ 717,000
Weighted average grant date fair value per share as of date of modification | $ / shares	$ 1.53
2014 Stock Option and Incentive Plan [Member] | Restricted Stock Units [Member] | Executive Officers [Member]
Stockholders Equity [Line Items]
Number of shares granted by board		470,000
2004 Stock Option Plan [Member]
Stockholders Equity [Line Items]
Closing price of common stock | $ / shares			$ 2.00
Stock options, intrinsic value | $			$ 0
Employee Stock Purchase Plan [Member]
Stockholders Equity [Line Items]
Number of shares reserved for future issuance			600,000			31,555
Percentage of outstanding common stock increased to shares available for grant			1.00%
Stock-based compensation expense | $			$ 18,000	$ 20,000
Number of shares available for issuance			269,863