v2.4.0.8
Stockholders' Equity - Summary of Option Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 36 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Shares, Outstanding, Beginning balance 643,000  
Shares, Granted 275,000  
Shares, Expired (25,000) 0
Shares, Forfeited     
Shares, Outstanding, Ending balance 893,000 893,000
Shares, Vested and expected to vest 861,000 861,000
Shares, Exercisable, Ending balance 617,000 617,000
Wtd. Avg. Exercise Price Outstanding, Beginning balance $ 0.90  
Wtd. Avg. Exercise Price, Granted $ 0.73  
Wtd. Avg. Exercise Price, Expired $ 5.44  
Wtd. Avg. Exercise Price, Forfeited     
Wtd. Avg. Exercise Price, Outstanding, Ending balance $ 0.72 $ 0.72
Wtd. Avg. Exercise Price, Vested and expected to vest $ 0.72 $ 0.72
Wtd. Avg. Exercise Price, Exercisable, Ending balance $ 0.71 $ 0.71
Wtd. Avg. Remaining Contractual Life, Outstanding 4 years 9 months 4 days  
Wtd. Avg. Remaining Contractual Life, Vested and expected to vest 4 years 7 months 17 days  
Wtd. Avg. Remaining Contractual Life, Exercisable 3 years 9 months 15 days  
Aggregate Intrinsic Value, Outstanding $ 741 $ 741
Aggregate Intrinsic Value, Vested and expected to vest 715 715
Aggregate Intrinsic Value, Exercisable $ 519 $ 519