Stockholders' Equity - Additional Information (Detail)				1 Months Ended	3 Months Ended
	May. 22, 2014	Aug. 14, 2013 $ / shares shares	Jun. 06, 2011 shares	Nov. 30, 2010 $ / shares shares	Mar. 31, 2015 USD ($) $ / shares shares	Mar. 31, 2014 USD ($) shares	Dec. 31, 2014 USD ($)	Jun. 30, 2010 shares
Stockholders Equity [Line Items]
Reverse stock split, conversion ration	0.1
Number of additional common stock to be purchased by the warrant				409,763
Warrant exercise price | $ / shares		$ 10.00		$ 26.50
Warrant expiration date				Nov. 14, 2015
Issuance of common stock in connection with common stock offerings (in shares)		834,847
Shares issued, price per share | $ / shares		$ 8.50
Common stock reserved for future issuance					3,122,559
Stock-based compensation expense | $					$ 1,242,000	$ 200,000
Unrecognized compensation expense | $					$ 2,100,000
Unrecognized stock-based compensation expense, weighted average period of recognition					2 years 9 months 26 days
Shares excluded from calculation of diluted loss per share					2,689,291	3,980,609
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax | $					$ 1,100,000		$ 1,700,000
Foreign currency translation reclassified into net loss upon acquisition of noncontrolling interest | $					444,000
Restricted Stock Units (RSUs)
Stockholders Equity [Line Items]
Unrecognized compensation expense | $					$ 7,200,000
Unrecognized stock-based compensation expense, weighted average period of recognition					3 years 1 month 24 days
Employee Stock Purchase Plan
Stockholders Equity [Line Items]
Common stock reserved for future issuance					293,888
Temporary suspension effective date					Jan. 01, 2014
Stock-based compensation expense | $					$ 0	$ 0
2010 Plan
Stockholders Equity [Line Items]
Common stock reserved for future issuance								300,000
Stock Incentive Plan Twenty Eleven
Stockholders Equity [Line Items]
Common stock reserved for future issuance			400,000		139,380
Number of shares available for grant			859,956
Stock Incentive Plan Twenty Eleven | Restricted Stock Units (RSUs)
Stockholders Equity [Line Items]
Aggregate restricted stock units outstanding					744,421
Stock Option Plan 2007
Stockholders Equity [Line Items]
Shares of common stock available for delivery			459,956
Private Placement Investors
Stockholders Equity [Line Items]
Number of additional common stock to be purchased by the warrant		834,847
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
Warrant expiration date					Aug. 13, 2019
Warrants vested					0
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
Warrant expiration date					Mar. 31, 2019
Warrants exercised					0