Stockholders' Equity - Additional Information (Detail) - USD ($)				12 Months Ended		55 Months Ended
	May 12, 2016	Oct. 09, 2014	Aug. 14, 2013	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2015	Sep. 30, 2016	Mar. 31, 2016	Mar. 31, 2014	Aug. 15, 2013	Jun. 06, 2011	Jun. 30, 2010
Stockholders Equity [Line Items]
Preferred stock, shares authorized				10,000,000	10,000,000	10,000,000
Preferred stock, par value				$ 0.001	$ 0.001	$ 0.001
Preferred stock, outstanding				0	0	0
Number of warrants not exercised				671,878
Common stock reserved for future issuance				4,113,315
Stock options, outstanding number				832,941	781,804	781,804
Exercise share warrant				0	5,180
Unrecognized compensation expense				$ 1,400,000
Unrecognized stock-based compensation expense, weighted average period of recognition				2 years 1 month 6 days
Shares excluded from calculation of diluted net loss per share				3,488,448	2,255,124
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax				$ 2,100,000	$ 2,200,000	$ 2,200,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax					400,000
Repurchase of common stock, period		1 year
Repurchase program expiration date		Oct. 09, 2015
Repurchase of common stock, value				$ 221,000	$ 1,915,000
Stock Repurchase Program
Stockholders Equity [Line Items]
Repurchase of common stock (in shares)					358,502
Repurchase of common stock, value					$ 1,800,000
Employee Stock Option
Stockholders Equity [Line Items]
Weighted-average grant date fair value per option for options granted				$ 4.36	$ 0
Stock Options One
Stockholders Equity [Line Items]
Percentage of stock options vesting				25.00%
Stock options vesting period				4 years
Stock Options Two
Stockholders Equity [Line Items]
Percentage of stock options vesting				25.00%
Stock options vesting period				1 year
Stock Options Five
Stockholders Equity [Line Items]
Percentage of stock options vesting				100.00%
Stock Options Three
Stockholders Equity [Line Items]
Percentage of stock options vesting				100.00%
Stock options vesting period				1 year
Stock Options Four
Stockholders Equity [Line Items]
Stock options vesting period				4 years
Stock Option Plan 1997
Stockholders Equity [Line Items]
Stock options, outstanding number				7,379
Stock Option Plan 2000
Stockholders Equity [Line Items]
Stock options, outstanding number				0
Stock Option Plan 2007
Stockholders Equity [Line Items]
Stock options, outstanding number				6,741
Stock Option Plan 2011
Stockholders Equity [Line Items]
Stock options, outstanding number				818,821
Restricted Stock Units (RSUs)
Stockholders Equity [Line Items]
Unrecognized compensation expense				$ 2,600,000
Unrecognized stock-based compensation expense, weighted average period of recognition				3 years 1 month 6 days
Repurchase of common stock (in shares)				109,192
2010 Plan
Stockholders Equity [Line Items]
Common stock reserved for future issuance												300,000
2011 Plan
Stockholders Equity [Line Items]
Common stock reserved for future issuance											400,000
Number of shares available for grant											859,956
Increase in shares of common stock authorized for issuance	2,000,000					1,000,000
2011 Plan | Restricted Stock Units (RSUs)
Stockholders Equity [Line Items]
Aggregate restricted stock units outstanding				1,973,459
2007 Plan and 2010 Plan
Stockholders Equity [Line Items]
Number of shares available for grant											459,956
Private Placement
Stockholders Equity [Line Items]
Warrants issued to purchase common stock										747,969
Warrant exercise price			$ 10.00
Issuance of common stock in connection with common stock offerings (in shares)			834,847
Shares issued, price per share			$ 8.50
Warrant term			4 years
Private Placement Agent
Stockholders Equity [Line Items]
Warrant exercise price			$ 10.00
Opus Bank
Stockholders Equity [Line Items]
Warrant exercise price									$ 9.90
Consultant Warrant
Stockholders Equity [Line Items]
Warrant exercise price				$ 10.70
Warrants expiration date				Aug. 13, 2019
Warrants exercised				0
Number of warrants not exercised				85,000
Opus Warrant
Stockholders Equity [Line Items]
Warrant exercise price				$ 2.19
Warrants expiration date				Mar. 31, 2019
Number of warrants not exercised				200,000
Opus Warrant | Opus Bank
Stockholders Equity [Line Items]
Warrants issued to purchase common stock				100,000
Warrant exercise price								$ 2.19	$ 9.90
Warrants expiration date				Mar. 31, 2019
Warrants exercised				0
Terms of new warrants issues				The terms of any new warrants issued will be identical to those of the existing warrant, except that each new warrant issued will be exercisable for 100,000 shares and have an exercise price equal to the average closing price of the Company’s common stock for the five trading days ending on the last day of the quarter with respect to which the new warrant is issued. In addition, the existing registration rights agreement was amended to include the new warrants and change the circumstances under which the Company must register shares underlying the warrants issued to Opus (the “Amended Rights Agreement”).
New Opus Warrant 1
Stockholders Equity [Line Items]
Warrant exercise price				$ 2.22			$ 2.22
Warrants expiration date				Sep. 30, 2021
Number of warrants not exercised				100,000
New Opus Warrant 2
Stockholders Equity [Line Items]
Warrant exercise price				$ 3.61
Warrants expiration date				Dec. 31, 2021
Number of warrants not exercised				100,000
2013 Private Placement Warrants
Stockholders Equity [Line Items]
Warrant exercise price				$ 10.00
Warrants expiration date				Aug. 14, 2017
Number of warrants not exercised				186,878
Maximum
Stockholders Equity [Line Items]
Repurchase of common stock, authorized amount		$ 5,000,000
Maximum | Employee Stock Option
Stockholders Equity [Line Items]
Stock options plans expiration period				10 years
Minimum | Employee Stock Option
Stockholders Equity [Line Items]
Stock options plans expiration period				7 years
Common Stock
Stockholders Equity [Line Items]
Repurchase of common stock (in shares)				109,000	374,000
Common Stock | Private Placement
Stockholders Equity [Line Items]
Warrants issued to purchase common stock			834,847
Common Stock | Private Placement Agent
Stockholders Equity [Line Items]
Number of additional common stock to be purchased by the warrant			100,000
Common Stock | Opus Warrant | Opus Bank
Stockholders Equity [Line Items]
Warrants issued to purchase common stock								200,000
Number of additional common stock to be purchased by the warrant				100,000
Common Stock | New Opus Warrant 1
Stockholders Equity [Line Items]
Warrants issued to purchase common stock							100,000
Common Stock | New Opus Warrant 2
Stockholders Equity [Line Items]
Warrants issued to purchase common stock				100,000
Common Stock | Maximum | Opus Bank
Stockholders Equity [Line Items]
Warrants issued to purchase common stock									100,000
Common Stock | Maximum | Consultant Warrant
Stockholders Equity [Line Items]
Warrants issued to purchase common stock				85,000
Common Stock | Maximum | Opus Warrant | Opus Bank
Stockholders Equity [Line Items]
Warrants issued to purchase common stock									100,000
Series A Participating Preferred Stock
Stockholders Equity [Line Items]
Preferred stock, shares authorized				40,000
Preferred stock, par value				$ 0.001	$ 0.001	$ 0.001
Preferred stock, outstanding				0	0	0