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Stock-Based Compensation - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Mar. 31, 2014
2009 Stock Option Plan [Member]
Mar. 31, 2013
2009 Stock Option Plan [Member]
Dec. 31, 2013
2009 Stock Option Plan [Member]
Mar. 31, 2014
2009 Stock Option Plan [Member]
Minimum [Member]
Mar. 31, 2014
2009 Stock Option Plan [Member]
Maximum [Member]
May 02, 2014
2009 Stock Option Plan [Member]
Subsequent Event [Member]
Feb. 28, 2014
2014 Equity Incentive Plan [Member]
Mar. 31, 2014
2014 Equity Incentive Plan [Member]
Mar. 31, 2014
2014 Equity Incentive Plan [Member]
Maximum [Member]
Feb. 28, 2014
2014 Employee Stock Purchase Plan [Member]
Mar. 31, 2014
2014 Employee Stock Purchase Plan [Member]
Mar. 31, 2014
2014 Employee Stock Purchase Plan [Member]
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Percentage of exercise price             100.00% 110.00%              
Vesting period of options             3 years 4 years              
Expiration period of options       10 years                      
Compensation cost $ 110 $ 42   $ 110 $ 42                    
Total income tax benefit recognized       0 0                    
Cash received from option exercised $ 5     $ 5   $ 5                  
Effective date of equity incentive plan                   May 02, 2014          
Number of additional awards expected to be granted                 0            
Number of shares of common stock for future issuance 2,169,148   2,120,398                 257,352      
Equity incentive plan, activity of share reserve, description                     The share reserve will automatically increase on January 1st of each year, for a period of not more than ten years, commencing on January 1, 2015 and ending on January 1, 2024, in an amount equal to 4.0% of the total number of shares of Capital Stock outstanding on December 31st of the preceding calendar year        
Common stock issuable period                       10 years      
Common stock outstanding percentage                     4.00%     0.80%  
Number of shares of common stock for future issuance, board of directors prerogative, increase in period                     0     0  
Effective date of employee stock purchase plan                         May 02, 2014    
Number of shares of common stock issuable                             47,794
Common stock issuable description                           The number of shares of common stock that are automatically added on January 1st of each year for a period of ten years, commencing on January 1, 2015 and ending on January 1, 2024, in an amount equal to the lesser of (i) 0.8% of the total number of shares of outstanding common stock on December 31 of the preceding calendar year, and (ii) 29,411 shares of common stock  
Common stock issuable period                           10 years  
Employee stock purchase plan, number of shares, which might be added to common stock outstanding                           29,411