|
Summary of Information About Stock Options Outstanding (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
|
12 Months Ended |
|
Dec. 31, 2012
|
Dec. 31, 2011
|
| Schedule Of Stock Option Activity [Line Items] |
|
|
| Options outstanding, Number of Options |
2,313,526 |
3,614,530 |
| Options outstanding, Weighted average remaining life (years) |
7 years 10 months 13 days |
6 years 8 months 1 day |
| Options outstanding, Aggregate intrinsic value |
$ 2,845 |
$ 6,889 |
| Options exercisable, Number of Options |
808,633 |
1,008,031 |
| Options exercisable, Weighted average remaining life (years) |
6 years 5 months 5 days |
5 years 10 months 28 days |
| Options exerciseable, Aggregate intrinsic value |
2,471 |
5,082 |
|
$0.38
|
|
|
| Schedule Of Stock Option Activity [Line Items] |
|
|
| Exercise price |
$ 0.38 |
$ 0.38 |
| Options outstanding, Number of Options |
57,264 |
145,406 |
| Options outstanding, Weighted average remaining life (years) |
8 years 26 days |
9 years 26 days |
| Options outstanding, Aggregate intrinsic value |
385 |
978 |
| Options exercisable, Number of Options |
57,264 |
145,406 |
| Options exercisable, Weighted average remaining life (years) |
8 years 26 days |
9 years 26 days |
| Options exerciseable, Aggregate intrinsic value |
385 |
978 |
|
$1.34
|
|
|
| Schedule Of Stock Option Activity [Line Items] |
|
|
| Exercise price |
$ 1.34 |
$ 1.34 |
| Options outstanding, Number of Options |
106,777 |
257,680 |
| Options outstanding, Weighted average remaining life (years) |
3 years 1 month 6 days |
4 years 1 month 6 days |
| Options outstanding, Aggregate intrinsic value |
617 |
1,489 |
| Options exercisable, Number of Options |
106,777 |
257,680 |
| Options exercisable, Weighted average remaining life (years) |
3 years 1 month 6 days |
4 years 1 month 6 days |
| Options exerciseable, Aggregate intrinsic value |
617 |
1,489 |
|
$1.92
|
|
|
| Schedule Of Stock Option Activity [Line Items] |
|
|
| Exercise price |
$ 1.92 |
$ 1.92 |
| Options outstanding, Number of Options |
23,143 |
23,143 |
| Options outstanding, Weighted average remaining life (years) |
4 years 3 months |
5 years 3 months 4 days |
| Options outstanding, Aggregate intrinsic value |
120 |
120 |
| Options exercisable, Number of Options |
23,143 |
23,143 |
| Options exercisable, Weighted average remaining life (years) |
4 years 3 months |
5 years 3 months 4 days |
| Options exerciseable, Aggregate intrinsic value |
120 |
120 |
|
$2.74
|
|
|
| Schedule Of Stock Option Activity [Line Items] |
|
|
| Exercise price |
$ 2.74 |
$ 2.74 |
| Options outstanding, Number of Options |
186,286 |
312,572 |
| Options outstanding, Weighted average remaining life (years) |
4 years 7 months 13 days |
5 years 6 months 15 days |
| Options outstanding, Aggregate intrinsic value |
815 |
1,368 |
| Options exercisable, Number of Options |
186,286 |
307,572 |
| Options exercisable, Weighted average remaining life (years) |
4 years 7 months 13 days |
5 years 6 months 15 days |
| Options exerciseable, Aggregate intrinsic value |
815 |
1,346 |
|
$3.29
|
|
|
| Schedule Of Stock Option Activity [Line Items] |
|
|
| Exercise price |
$ 3.29 |
$ 3.29 |
| Options outstanding, Number of Options |
183,442 |
564,286 |
| Options outstanding, Weighted average remaining life (years) |
6 years 9 months 7 days |
7 years 6 months |
| Options outstanding, Aggregate intrinsic value |
703 |
2,163 |
| Options exercisable, Number of Options |
126,014 |
212,929 |
| Options exercisable, Weighted average remaining life (years) |
6 years 8 months 19 days |
7 years 4 months 6 days |
| Options exerciseable, Aggregate intrinsic value |
483 |
816 |
|
$5.91
|
|
|
| Schedule Of Stock Option Activity [Line Items] |
|
|
| Exercise price |
$ 5.91 |
$ 5.91 |
| Options outstanding, Number of Options |
169,857 |
363,142 |
| Options outstanding, Weighted average remaining life (years) |
7 years 7 months 21 days |
8 years 4 months 28 days |
| Options outstanding, Aggregate intrinsic value |
205 |
438 |
| Options exercisable, Number of Options |
42,571 |
|
| Options exercisable, Weighted average remaining life (years) |
7 years 7 months 2 days |
|
| Options exerciseable, Aggregate intrinsic value |
51 |
|
|
$7.12
|
|
|
| Schedule Of Stock Option Activity [Line Items] |
|
|
| Exercise price |
$ 7.12 |
$ 7.12 |
| Options outstanding, Number of Options |
1,586,757 |
1,887,000 |
| Options outstanding, Weighted average remaining life (years) |
8 years 9 months 7 days |
6 years 6 months 29 days |
| Options outstanding, Aggregate intrinsic value |
|
|
| Options exercisable, Number of Options |
266,578 |
|
| Options exercisable, Weighted average remaining life (years) |
8 years 6 months 11 days |
|
| Options exerciseable, Aggregate intrinsic value |
|
|
|
$1.68
|
|
|
| Schedule Of Stock Option Activity [Line Items] |
|
|
| Exercise price |
|
$ 1.68 |
| Options outstanding, Number of Options |
|
58,286 |
| Options outstanding, Weighted average remaining life (years) |
|
2 years 10 months 2 days |
| Options outstanding, Aggregate intrinsic value |
|
317 |
| Options exercisable, Number of Options |
|
58,286 |
| Options exercisable, Weighted average remaining life (years) |
|
2 years 10 months 2 days |
| Options exerciseable, Aggregate intrinsic value |
|
317 |
|
$1.96
|
|
|
| Schedule Of Stock Option Activity [Line Items] |
|
|
| Exercise price |
|
$ 1.96 |
| Options outstanding, Number of Options |
|
3,015 |
| Options outstanding, Weighted average remaining life (years) |
|
9 years 26 days |
| Options outstanding, Aggregate intrinsic value |
|
16 |
| Options exercisable, Number of Options |
|
3,015 |
| Options exercisable, Weighted average remaining life (years) |
|
9 years 26 days |
| Options exerciseable, Aggregate intrinsic value |
|
$ 16 |