Annual report pursuant to section 13 and 15(d)

Stock Option Plans - Additional Information (Detail)

v2.4.0.6
Stock Option Plans - Additional Information (Detail) (USD $)
1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
December 31, 2013
Dec. 31, 2012
December 31, 2014
Dec. 31, 2012
December 31, 2015
Dec. 31, 2012
Nineteen Ninety Four Plan
Dec. 31, 2004
Nineteen Ninety Four Plan
Dec. 31, 2012
Two Thousand Three Plan
Sep. 18, 2003
Two Thousand Three Plan
Dec. 31, 2010
Amended Two Thousand Three Plan
Dec. 31, 2008
Amended Two Thousand Three Plan
Dec. 31, 2007
Amended Two Thousand Three Plan
Dec. 31, 2012
Performance Based Stock Options
Dec. 31, 2011
Performance Based Stock Options
Dec. 31, 2010
Performance Based Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Common stock reserved for future issuance                 450,000   450,000 1,160,000 810,000 670,000      
Shares of common stock vested and exercisable   701,201           12,000   689,201              
Percentage of option price               100.00%   100.00%              
Stock option period               10 years   10 years              
Vesting period 5 years             3 years   3 years              
Grant date weighted average fair value options   $ 0.39 $ 2.24                       $ 0.00 $ 2.49  
Total intrinsic value   $ 0 $ 0                            
Number of Shares Outstanding Under Option   706,803 737,020 670,355                     161,240 161,240 132,260
Weighted average exercise price of vested options outstanding   $ 4.29                              
Weighted average remaining contractual term   4 years 10 months 24 days                              
Aggregate intrinsic value   0                              
Future compensation cost related to non-vested awards         601 314 58                    
Total fair value of shares vested   $ 157,939 $ 253,000