Stockholders' Equity - Additional Information (Detail)						1 Months Ended	12 Months Ended
	Oct. 09, 2014 USD ($)	Sep. 16, 2014 USD ($) $ / shares shares	May. 22, 2014	Aug. 14, 2013 USD ($) $ / shares shares	Jun. 06, 2011 shares	Nov. 30, 2010 $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Jun. 30, 2010 shares
Stockholders Equity [Line Items]
Reverse stock split, conversion ratio			0.1
Preferred stock, shares authorized							10,000,000	10,000,000
Preferred stock, par value | $ / shares							$ 0.001	$ 0.001
Preferred stock, outstanding							0	0
Issuance of common stock in connection with common stock offerings (in shares)				834,847
Shares issued, price per share | $ / shares				$ 8.50
Number of additional common stock to be purchased by the warrant						409,763
Warrant exercise price | $ / shares				$ 10.00		$ 26.50
Issuance of common stock in connection with capital raise and common stock offerings, net of issuance costs | $				$ 7,100,000				$ 35,755,000
Cash paid to placement agent | $				$ 600,000
Additional warrants issued to purchase common stock				100,000
Common stock reserved for future issuance							2,767,256
Stock-based compensation expense | $							$ 4,667,000	$ 2,163,000
Stock options, outstanding number							781,804	897,115
Exercise share warrant							5,180	27,733
Unrecognized compensation expense | $							$ 1,500,000
Unrecognized stock-based compensation expense, weighted average period of recognition							2 years 2 months 12 days
Shares excluded from calculation of diluted loss per share							2,255,124	1,354,866
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax | $							$ 2,200,000	$ 1,700,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax | $							444,000
Repurchase of common stock | $	$ 5,000,000						$ 1,800,000
Repurchase of common stock, Period	1 year
Repurchase of common stock (in shares)							358,502
Employee Stock Option
Stockholders Equity [Line Items]
Weighted-average grant date fair value per option for options granted | $ / shares							$ 0	$ 9.71
Employee Stock Option | Minimum
Stockholders Equity [Line Items]
Stock options plans expiration period							7 years
Employee Stock Option | Maximum
Stockholders Equity [Line Items]
Stock options plans expiration period							10 years
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							11,509
Stock Option Plan 2000
Stockholders Equity [Line Items]
Stock options, outstanding number							15,169
Stock Option Plan 2007
Stockholders Equity [Line Items]
Stock options, outstanding number							53,560
Stock Option Plan 2011
Stockholders Equity [Line Items]
Stock options, outstanding number							709,644
Restricted Stock Units (RSUs)
Stockholders Equity [Line Items]
Unrecognized compensation expense | $							$ 5,300,000
Unrecognized stock-based compensation expense, weighted average period of recognition							2 years 6 months
Restricted Stock And R S U
Stockholders Equity [Line Items]
Repurchase of common stock (in shares)							15,143
Stock Option Plan Twenty Ten
Stockholders Equity [Line Items]
Common stock reserved for future issuance									300,000
Stock Option Plan 2011
Stockholders Equity [Line Items]
Common stock reserved for future issuance					400,000
Authorized					459,956
Number of shares available for grant					859,956
Stock Incentive Plan Twenty Eleven
Stockholders Equity [Line Items]
Common stock reserved for future issuance							218,244
Stock Incentive Plan Twenty Eleven | Restricted Stock Units (RSUs)
Stockholders Equity [Line Items]
Aggregate restricted stock units outstanding							721,918
Consultant Warrant
Stockholders Equity [Line Items]
Number of additional common stock to be purchased by the warrant							85,000
Warrant exercise price | $ / shares							$ 10.70
Warrants expiration date							Aug. 31, 2019
Warrants exercised							0
Opus Warrant
Stockholders Equity [Line Items]
Warrant exercise price | $ / shares							$ 9.90
Opus Warrant | Opus Bank
Stockholders Equity [Line Items]
Number of additional common stock to be purchased by the warrant							100,000
Warrant exercise price | $ / shares							$ 9.90
Warrants expiration date							Mar. 31, 2014
Warrants exercised							0
Underwritten Public Offering
Stockholders Equity [Line Items]
Issuance of common stock in connection with common stock offerings (in shares)		2,000,000
Initial Public Offering
Stockholders Equity [Line Items]
Issuance of common stock in connection with common stock offerings (in shares)		2,300,000
Shares issued, price per share | $ / shares		$ 15.00
Issuance cost of common stock | $		$ 400,000
Net proceeds from sale of common stock in public offering | $		31,600,000
Underwriting discount on issuance of shares | $		$ 2,500,000
Over-Allotments
Stockholders Equity [Line Items]
Common stock additional shares issued		300,000
Employee Stock Purchase Plan
Stockholders Equity [Line Items]
Common stock reserved for future issuance							293,888
Stock-based compensation expense | $							$ 0	$ 0
Temporary suspension effective date							Jan. 01, 2014
Private Placement Investors
Stockholders Equity [Line Items]
Number of additional common stock to be purchased by the warrant				834,847
Private Placement
Stockholders Equity [Line Items]
Issuance cost of common stock | $				$ 800,000
Private Placement Agent.
Stockholders Equity [Line Items]
Number of additional common stock to be purchased by the warrant				100,000
Series A Preferred Stock
Stockholders Equity [Line Items]
Preferred stock, shares authorized							40,000	40,000
Preferred stock, par value | $ / shares							$ 0.001	$ 0.001
Preferred stock, outstanding							0	0