EXHIBIT 1
 
 
TRANSACTIONS DURING PAST 60 DAYS
 
The Reporting Persons engaged in the following transactions in shares of Common Stock of the Company during the past 60 days.  Such transactions involved the sale of shares on the NASDAQ Global Select Market.  Certain of the prices reported below reflect the weighted average sale price of the shares of Common Stock sold on the relevant date.  The Reporting Persons hereby undertake to provide upon request to the SEC staff full information regarding the number of shares and prices at which each transaction was effected.

Date
  
Type
  
Price
  
Shares
3/12/2012
  
Purchase
  
 $ 3.6000
  
1170
3/13/20121
  
Purchase
  
 $ 3.6076
  
2207
3/14/20122
  
Purchase
  
 $ 3.6314
  
4900
3/15/20123
  
Purchase
  
 $ 3.6440
  
5000
3/16/20124
  
Purchase
  
 $ 3.5997
  
22279
3/19/20125
  
Purchase
  
 $ 3.5990
  
11000
3/20/20126
  
Purchase
  
 $ 3.5500
  
250419
3/22/20127
  
Purchase
  
 $ 3.5234
  
3723
3/23/20128
  
Purchase
  
 $ 3.5199
  
207012
3/26/20129
  
Purchase
  
 $ 3.7219
  
18013
3/27/201210
  
Purchase
  
 $ 3.6995
  
6300
3/28/201211
  
Purchase
  
 $ 3.6654
  
2385
3/29/2012
  
Purchase
  
 $ 3.6400
  
3527
3/30/201212
  
Purchase
  
 $ 3.6339
  
6386
4/2/201213
  
Purchase
  
 $ 3.5480
  
4896
4/3/201214
  
Purchase
  
 $ 3.4816
  
11505
4/4/201215
  
Purchase
  
 $ 3.2318
  
17000
4/5/201216
  
Purchase
  
 $ 3.1511
  
4563
4/9/201217
  
Purchase
  
 $ 2.9546
  
4220
4/10/201218
  
Purchase
  
 $ 2.9255
  
4400
4/11/201219
  
Purchase
  
 $ 3.0211
  
8500
4/12/201220
  
Purchase
  
 $ 3.0858
  
3165
 
1 This transaction was executed in multiple trades at prices ranging from $3.60 – 3.61. 
2 This transaction was executed in multiple trades at prices ranging from $3.60 – 3.65. 
3 This transaction was executed in multiple trades at prices ranging from $3.63 – 3.66. 
4 This transaction was executed in multiple trades at prices ranging from $3.59 – 3.62. 
5 This transaction was executed in multiple trades at prices ranging from $3.58 – 3.60. 
6 This transaction was executed in multiple trades at prices ranging from $3.55 – 3.56. 
7 This transaction was executed in multiple trades at prices ranging from $3.51 – 3.55. 
8 This transaction was executed in multiple trades at prices ranging from $3.50 – 3.52. 
9 This transaction was executed in multiple trades at prices ranging from $3.69 – 3.75. 
10 This transaction was executed in multiple trades at prices ranging from $3.69 – 3.70. 
11 This transaction was executed in multiple trades at prices ranging from $3.66 – 3.67. 
12 This transaction was executed in multiple trades at prices ranging from $3.62 – 3.64. 
13 This transaction was executed in multiple trades at prices ranging from $3.50 – 3.58. 
14 This transaction was executed in multiple trades at prices ranging from $3.40 – 3.50. 
15 This transaction was executed in multiple trades at prices ranging from $3.22 – 3.27. 
16 This transaction was executed in multiple trades at prices ranging from $3.07 – 3.20. 
17 This transaction was executed in multiple trades at prices ranging from $2.90 – 2.99. 
18 This transaction was executed in multiple trades at prices ranging from $2.88 – 2.96. 
19 This transaction was executed in multiple trades at prices ranging from $2.87 – 3.06. 
20 This transaction was executed in multiple trades at prices ranging from $3.07 – 3.10. 

 
 
 
 
 
 
4/13/201221
  
Purchase
  
 $ 3.0250
  
10000
4/16/201222
  
Purchase
  
 $ 2.9288
  
5000
4/17/201223
  
Purchase
  
 $ 2.9448
  
3810
4/18/201224
  
Purchase
  
 $ 2.9608
  
12809
4/19/201225
  
Purchase
  
 $ 3.0001
  
7948
4/20/201226
  
Purchase
  
 $ 3.0642
  
13671
4/23/201227
  
Purchase
  
 $ 2.9986
  
8100
4/24/201228
  
Purchase
  
 $ 2.9980
  
4109
4/25/201229
  
Purchase
  
 $ 3.0135
  
10046
4/26/201230
  
Purchase
  
 $ 3.0535
  
11100
4/27/201231
  
Purchase
  
 $ 3.3088
  
12800
4/30/201232
  
Purchase
  
 $ 3.6201
  
25483
5/1/201233
  
Purchase
  
 $ 3.6328
  
10700
5/2/201234
  
Purchase
  
 $ 3.6400
  
8400
5/3/201235
  
Purchase
  
 $ 3.6161
  
13425
5/4/201236
  
Purchase
  
 $ 3.6230
  
8500
5/7/201237
  
Purchase
  
 $ 3.7461
  
16807
5/8/201238
  
Purchase
  
 $ 3.7436
  
30000
5/9/201239
  
Purchase
  
 $ 3.7168
  
25300
5/10/201240
  
Purchase
  
 $ 3.7440
  
6900
 
21 This transaction was executed in multiple trades at prices ranging from $3.00 – 3.05. 
22 This transaction was executed in multiple trades at prices ranging from $2.89 – 2.96. 
23 This transaction was executed in multiple trades at prices ranging from $2.93 – 2.95. 
24 This transaction was executed in multiple trades at prices ranging from $2.95 – 2.99. 
25 This transaction was executed in multiple trades at prices ranging from $3.00 – 3.01. 
26 This transaction was executed in multiple trades at prices ranging from $2.80 – 3.10. 
27 This transaction was executed in multiple trades at prices ranging from $2.95 – 3.02. 
28 This transaction was executed in multiple trades at prices ranging from $2.98 – 3.00. 
29 This transaction was executed in multiple trades at prices ranging from $2.98 – 3.04. 
30 This transaction was executed in multiple trades at prices ranging from $3.04 – 3.16. 
31 This transaction was executed in multiple trades at prices ranging from $3.25 – 3.36. 
32 This transaction was executed in multiple trades at prices ranging from $3.40 – 3.65. 
33 This transaction was executed in multiple trades at prices ranging from $3.58 – 3.65. 
34 Executions not available. 
35 This transaction was executed in multiple trades at prices ranging from $3.60 – 3.79. 
36 Executions not available. 
37 This transaction was executed in multiple trades at prices ranging from $3.60 – 3.85. 
38 This transaction was executed in multiple trades at prices ranging from $3.72 – 3.76. 
39 This transaction was executed in multiple trades at prices ranging from $3.65 – 3.75. 
40 This transaction was executed in multiple trades at prices ranging from $3.70 – 3.79.