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. 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 | Quantity | ||||
| 1/5/2016 | Sale | $ 4.1994 | 1 | 19000 | |||
| 1/6/2016 | Sale | $ 4.1460 | 2 | 25000 | |||
| 1/7/2016 | Sale | $ 4.0093 | 3 | 25000 | |||
| 1/8/2016 | Sale | $ 4.0093 | 4 | 6429 | |||
| 1/20/2016 | Sale | $ 3.3527 | 5 | 50000 | |||
| 1/21/2016 | Sale | $ 3.4924 | 6 | 39831 | |||
| 1/22/2016 | Sale | $ 3.6725 | 7 | 55000 | |||
| 1/25/2016 | Sale | $ 3.5309 | 8 | 35584 | |||
| 1/26/2016 | Sale | $ 3.5977 | 9 | 44794 | |||
| 1/27/2016 | Sale | $ 3.5611 | 10 | 24967 | |||
| 1/28/2016 | Sale | $ 3.5691 | 11 | 77222 | |||
| 1/29/2016 | Sale | $ 3.6292 | 12 | 34759 | |||
| 2/1/2016 | Sale | $ 3.6432 | 13 | 43100 | |||
| 2/2/2016 | Sale | $ 3.4833 | 14 | 77423 | |||
| 2/3/2016 | Sale | $ 3.5402 | 15 | 111615 |
1Executed at prices ranging from 4.13 - 4.24
2Executed at prices ranging from 4.10 - 4.18
3Executed at prices ranging from 4.00 - 4.09
4Executed at prices ranging from 4.00 - 4.11
5Executed at prices ranging from 3.25 - 3.46
6Executed at prices ranging from 3.40 - 3.56
7Executed at prices ranging from 3.60 - 3.72
8Executed at prices ranging from 3.50 - 3.63
9Executed at prices ranging from 3.53 - 3.65
10Executed at prices ranging from 3.52 - 3.60
11Executed at prices ranging from 3.55 - 3.59
12Executed at prices ranging from 3.62 - 3.65
13Executed at prices ranging from 3.60 - 3.69
14Executed at prices ranging from 3.46 - 3.61
15Executed at prices ranging from 3.49 - 3.59
| 2/4/2016 | Sale | $ 3.6304 | 16 | 43100 | |||
| 2/5/2016 | Sale | $ 3.5139 | 17 | 86967 | |||
| 2/8/2016 | Sale | $ 2.9747 | 18 | 77300 | |||
| 2/9/2016 | Sale | $ 2.9796 | 19 | 152800 | |||
| 2/10/2016 | Sale | $ 3.0333 | 20 | 66396 | |||
| 2/11/2016 | Sale | $ 2.9995 | 21 | 38821 | |||
| 2/12/2016 | Sale | $ 2.9078 | 22 | 50000 | |||
| 2/16/2016 | Sale | $ 3.0213 | 23 | 38000 | |||
| 2/17/2016 | Sale | $ 3.0588 | 24 | 41900 | |||
| 2/18/2016 | Sale | $ 2.9789 | 25 | 40444 | |||
| 2/19/2016 | Sale | $ 3.0051 | 26 | 88981 | |||
| 2/22/2016 | Sale | $ 2.9929 | 27 | 25775 | |||
| 2/23/2016 | Sale | $ 2.9988 | 28 | 77133 | |||
| 2/24/2016 | Sale | $ 3.0342 | 29 | 39069 | |||
| 2/25/2016 | Sale | $ 3.0421 | 30 | 63500 |
16Executed at prices ranging from 3.55 - 3.69
17Executed at prices ranging from 3.47 - 3.55
18Executed at prices ranging from 2.88 - 3.22
19Executed at prices ranging from 2.92 - 3.03
20Executed at prices ranging from 2.99 - 3.09
21Executed at prices ranging from 2.96 - 3.02
22Executed at prices ranging from 2.85 - 2.97
23Executed at prices ranging from 2.97 - 3.04
24Executed at prices ranging from 3.03 - 3.09
25Executed at prices ranging from 2.96 - 3.05
26Executed at prices ranging from 2.97 - 3.02
27Executed at prices ranging from 2.98 - 3.01
28Executed at prices ranging from 2.98 - 3.03
29Executed at prices ranging from 2.98 - 3.06
30Executed at prices ranging from 3.00 - 3.07
