|
Summary of Stock Options (Detail) (USD $)
|
6 Months Ended |
|
|
Jun. 30, 2012
|
Jul. 01, 2010
|
| Number of Stock Options |
|
|
| Beginning Balance |
7,542,459 |
|
| Granted |
753,400 |
|
| Expired |
(483,896) |
|
| Forfeited |
(2,693) |
|
| Exercised |
|
|
| Ending Balance |
7,809,270 |
|
| Exercisable - June 30, 2012 |
6,177,948 |
|
| Available for grant - June 30, 2012 |
1,641,979 |
|
| Weighted-Average Exercise Price |
|
|
| Beginning Balance |
$ 0.41 |
|
| Granted |
$ 0.15 |
|
| Expired |
$ 0.33 |
|
| Forfeited |
$ 0.30 |
|
| Exercised |
|
|
| Ending Balance |
$ 0.39 |
|
| Exercisable - June 30, 2012 |
$ 0.44 |
$ 0.27 |
| Weighted Average Remaining Life (years) |
|
|
| Outstanding - June 30, 2012 |
5 years 9 months 22 days |
|
| Exercisable - June 30, 2012 |
5 years 7 days |
|
| Aggregate Intrinsic Value |
|
|
| Outstanding - December 31, 2011 |
$ 221,127 |
|
| Exercisable - June 30, 2012 |
$ 155,699 |
|
|
Outstanding - December 31, 2011
|
|
|
| Weighted-Average Exercise Price |
|
|
| Price range, lower limit |
$ 0.07 |
|
| Price range, upper limit |
$ 1.33 |
|
|
Granted
|
|
|
| Weighted-Average Exercise Price |
|
|
| Price range, lower limit |
$ 0.14 |
|
| Price range, upper limit |
$ 0.20 |
|
|
Expired
|
|
|
| Weighted-Average Exercise Price |
|
|
| Price range, lower limit |
$ 0.30 |
|
| Price range, upper limit |
$ 1.06 |
|
|
Forfeited
|
|
|
| Weighted-Average Exercise Price |
|
|
| Price range, lower limit |
$ 0.30 |
|
| Price range, upper limit |
$ 0.30 |
|
|
Outstanding - June 30, 2012
|
|
|
| Weighted-Average Exercise Price |
|
|
| Price range, lower limit |
$ 0.07 |
|
| Price range, upper limit |
$ 1.33 |
|
|
Exercisable - June 30, 2012
|
|
|
| Weighted-Average Exercise Price |
|
|
| Price range, lower limit |
$ 0.07 |
|
| Price range, upper limit |
$ 1.33 |
|