Stockholders' Equity - Additional Information (Detail)				1 Months Ended	3 Months Ended		9 Months Ended
	May. 22, 2014	Aug. 14, 2013 $ / shares shares	Jun. 06, 2011 shares	Nov. 30, 2010 $ / shares shares	Sep. 30, 2015 USD ($) $ / shares shares	Sep. 30, 2014 USD ($) shares	Sep. 30, 2015 USD ($) $ / shares shares	Sep. 30, 2014 USD ($) shares	Dec. 31, 2014 USD ($)	Mar. 31, 2014 $ / shares	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
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					2,760,038		2,760,038
Stock-based compensation expense | $							$ 3,700,000	$ 996,000
Unrecognized stock-based compensation expense, weighted average period of recognition							2 years 5 months 5 days
Shares excluded from calculation of diluted loss per share					2,323,430	2,761,161	2,323,430	2,761,161
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax | $					$ 2,000,000		$ 2,000,000		$ 1,700,000
Foreign currency translation reclassified into earnings upon acquisition of noncontrolling interest | $							444,000
Stock Option Plans
Stockholders Equity [Line Items]
Unrecognized compensation expense | $					1,600,000		1,600,000
Restricted Stock Units (RSUs)
Stockholders Equity [Line Items]
Unrecognized compensation expense | $					$ 5,800,000		$ 5,800,000
Unrecognized stock-based compensation expense, weighted average period of recognition							2 years 8 months 16 days
Employee Stock Purchase Plan
Stockholders Equity [Line Items]
Common stock reserved for future issuance					293,888		293,888
Temporary suspension effective date							Jan. 01, 2014
Stock-based compensation expense | $					$ 0	$ 0	$ 0	$ 0
Stock Option Plan 2010
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					171,811		171,811
Stock Incentive Plan Twenty Eleven | Restricted Stock Units (RSUs)
Stockholders Equity [Line Items]
Aggregate restricted stock units outstanding and unvested					638,245		638,245
Private Placement Investors
Stockholders Equity [Line Items]
Number of additional common stock to be purchased by the warrant		834,847
Opus Bank
Stockholders Equity [Line Items]
Warrant exercise price | $ / shares										$ 9.90
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		$ 10.70
Warrant exercised					0		0
Opus Warrant
Stockholders Equity [Line Items]
Warrant exercise price | $ / shares					$ 9.90		$ 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		$ 9.90
Warrant exercised					0		0