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
7/11/20121
  
Purchase
  
 $ 4.2245
  
2406
7/12/20122
  
Purchase
  
 $ 4.2173
  
2438
7/18/2012
  
Purchase
  
 $ 4.2500
  
299
7/19/20123
  
Purchase
  
 $ 4.2482
  
2793
7/20/20124
  
Purchase
  
 $ 4.1699
  
21370
7/23/20125
  
Purchase
  
 $ 4.0718
  
3558
7/24/20126
  
Purchase
  
 $ 4.0627
  
4800
7/25/20127
  
Purchase
  
 $ 3.9993
  
6165
7/26/20128
  
Purchase
  
 $ 3.9921
  
2886
7/27/2012
  
Purchase
  
 $ 3.8000
  
772
8/2/2012
  
Purchase
  
 $ 4.2500
  
1400
8/7/20129
  
Purchase
  
 $ 4.2424
  
41000
8/9/201210
  
Purchase
  
 $ 3.9256
  
12213
8/10/201211
  
Purchase
  
 $ 3.9226
  
1108
8/14/201212
  
Purchase
  
 $ 3.7428
  
5000
8/16/201213
  
Purchase
  
 $ 3.7412
  
4100
8/16/2012
  
Sell
  
 $ 3.7700
  
741
 
1 This transaction was executed in multiple trades at prices ranging from $4.21 – 4.25. 
2 This transaction was executed in multiple trades at prices ranging from $4.18 – 4.22. 
3 This transaction was executed in multiple trades at prices ranging from $4.24 – 4.25. 
4 This transaction was executed in multiple trades at prices ranging from $4.12 – 4.21. 
5 This transaction was executed in multiple trades at prices ranging from $4.02 – 4.10. 
6 This transaction was executed in multiple trades at prices ranging from $4.04 – 4.08. 
7 This transaction was executed in multiple trades at prices ranging from $3.98 – 4.00. 
8 Due to incomplete data available to the Reporting Persons, the Reporting Persons are reporting the average price of transactions effected on this date. 
9 This transaction was executed in multiple trades at prices ranging from $4.23 – 4.25. 
10 This transaction was executed in multiple trades at prices ranging from $3.88 – 3.95. 
11 This transaction was executed in multiple trades at prices ranging from $3.90 – 3.95. 
12 This transaction was executed in multiple trades at prices ranging from $3.71 – 3.75. 
13 This transaction was executed in multiple trades at prices ranging from $3.72 – 3.75.
 
 
 
 
 
8/17/201214
  
Purchase
  
 $ 3.7236
  
4862
8/20/201215
  
Purchase
  
 $ 3.6478
  
2300
8/21/201216
  
Purchase
  
 $ 3.7382
  
5000
8/22/201217
  
Purchase
  
 $ 3.6015
  
4643
8/23/201218
  
Purchase
  
 $ 3.5061
  
254
8/24/201219
  
Purchase
  
 $ 3.4650
  
3347
8/29/2012
  
Purchase
  
 $ 3.3000
  
638
8/30/201220
  
Purchase
  
 $ 3.2581
  
10000
8/31/201221
  
Purchase
  
 $ 3.0391
  
13200
 
14 This transaction was executed in multiple trades at prices ranging from $3.70 – 3.75. 
15 This transaction was executed in multiple trades at prices ranging from $3.64 – 3.70. 
16 This transaction was executed in multiple trades at prices ranging from $3.69 – 3.75. 
17 This transaction was executed in multiple trades at prices ranging from $3.58 – 3.63. 
18 This transaction was executed in multiple trades at prices ranging from $3.50 – 3.51. 
19 This transaction was executed in multiple trades at prices ranging from $3.41 – 3.47. 
20 This transaction was executed in multiple trades at prices ranging from $3.21 – 3.28. 
21 This transaction was executed in multiple trades at prices ranging from $2.94 – 3.15.