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 purchase of shares on the NASDAQ Capital Market. Certain of the prices reported below reflect the weighted average purchase price of the shares of Common Stock purchased 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
8/10/2015	Purchase	$	3.5981	1	7500
8/11/2015	Purchase	$	3.6685	2	5400
8/12/2015	Purchase	$	3.4840	3	15000
8/13/2015	Purchase	$	3.4602	4	5000
8/14/2015	Purchase	$	3.4999	5	5000
8/17/2015	Purchase	$	3.4954	6	49871
8/18/2015	Purchase	$	3.4992	7	6700
8/19/2015	Purchase	$	3.5000		100000
8/20/2015	Purchase	$	3.4998	8	200706
8/21/2015	Purchase	$	3.4598	9	4417
8/24/2015	Purchase	$	3.2400		5634
8/25/2015	Purchase	$	3.2625	10	17500
8/26/2015	Purchase	$	3.2472	11	12953
8/27/2015	Purchase	$	3.4001	12	521335
8/31/2015	Purchase	$	3.6068	13	3700
9/2/2015	Purchase	$	3.6709	14	4849

¹ This transaction was executed in multiple trades at prices ranging from $3.58 – 3.61.

² This transaction was executed in multiple trades at prices ranging from $3.59 – 3.72.

³ This transaction was executed in multiple trades at prices ranging from $3.43 – 3.50.

⁴ This transaction was executed in multiple trades at prices ranging from $3.42 – 3.48.

⁵ This transaction was executed in multiple trades at prices ranging from $3.46 – 3.50.

⁶ This transaction was executed in multiple trades at prices ranging from $3.48 – 3.50.

⁷ This transaction was executed in multiple trades at prices ranging from $3.47 – 3.50.

⁸ This transaction was executed in multiple trades at prices ranging from $3.45 – 3.50.

⁹ This transaction was executed in multiple trades at prices ranging from $3.45 – 3.46.

¹⁰ This transaction was executed in multiple trades at prices ranging from $3.19 – 3.30.

¹¹ This transaction was executed in multiple trades at prices ranging from $3.21 – 3.25.

¹² This transaction was executed in multiple trades at prices ranging from $3.40 – 3.42.

¹³ This transaction was executed in multiple trades at prices ranging from $3.55 – 3.63.

¹⁴ This transaction was executed in multiple trades at prices ranging from $3.61 – 3.68.

9/3/2015	Purchase	$	3.6423	15	5000
9/4/2015	Purchase	$	3.6425	16	2400
9/8/2015	Purchase	$	3.9858	17	2725
9/9/2015	Purchase	$	4.0133	18	1200
9/10/2015	Purchase	$	4.0075	19	12300
9/11/2015	Purchase	$	3.8500		10000
9/16/2015	Purchase	$	3.7780	20	4902
9/17/2015	Purchase	$	3.8568	21	5944
9/18/2015	Purchase	$	3.9742	22	15000
9/22/2015	Purchase	$	3.8963	23	400
9/23/2015	Purchase	$	3.8674	24	10000
9/25/2015	Purchase	$	3.9875	25	5100
9/29/2015	Purchase	$	3.9995	26	16784
9/30/2015	Purchase	$	3.9748	27	5000
10/1/2015	Purchase	$	3.8999	28	12568
10/5/2015	Purchase	$	3.9450		112
10/6/2015	Purchase	$	4.0000		3200
10/7/2015	Purchase	$	4.1515	29	10000

¹⁵ This transaction was executed in multiple trades at prices ranging from $3.62 – 3.65.

¹⁶ This transaction was executed in multiple trades at prices ranging from $3.63 – 3.65.

¹⁷ This transaction was executed in multiple trades at prices ranging from $3.95 – 3.99.

¹⁸ This transaction was executed in multiple trades at prices ranging from $4.00 – 4.04.

¹⁹ This transaction was executed in multiple trades at prices ranging from $3.95 – 4.05.

²⁰ This transaction was executed in multiple trades at prices ranging from $3.75 – 3.80.

²¹ This transaction was executed in multiple trades at prices ranging from $3.80 – 3.88.

²² This transaction was executed in multiple trades at prices ranging from $3.94 – 4.00.

²³ This transaction was executed in multiple trades at prices ranging from $3.89 – 3.90.

²⁴ This transaction was executed in multiple trades at prices ranging from $3.83 – 3.89.

²⁵ This transaction was executed in multiple trades at prices ranging from $3.97 – 4.00.

²⁶ This transaction was executed in multiple trades at prices ranging from $3.98 – 4.00.

²⁷ This transaction was executed in multiple trades at prices ranging from $3.93 – 4.00.

²⁸ This transaction was executed in multiple trades at prices ranging from $3.82 – 3.95.

²⁹ This transaction was executed in multiple trades at prices ranging from $4.12 – 4.19.