Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Cumulative Translation Adjustment [Member]	Unrealized Gain/Loss on Investments [Member]	Treasury Stock [Member]
Beginning balance at Jan. 31, 2012	$ 210,938	$ 326	$ 213,880	$ 6,507	$ (9,810)	$ 36	$ (1)
Beginning balance, Shares at Jan. 31, 2012		32,534,444					(39,784)
Issuance of common stock pursuant to exercise of stock options	2,191	2	2,189
Issuance of common stock pursuant to exercise of stock options, Shares	304,550	304,550
Issuance of common stock pursuant to vesting of restricted stock units		4	(4)
Issuance of common stock pursuant to vesting of restricted stock units, Shares		359,676
Issuance of common stock pursuant to deferred consideration	586	1	585
Issuance of common stock pursuant to deferred consideration, Shares		75,680
Purchase of treasury shares	(6,194)		(6,194)
Purchase of treasury shares, Shares							(764,024)
Retirement of shares	(6)	(6)
Retirement of shares, Shares		(764,024)					764,024
Stock-based compensation expense	5,903		5,903
Change in fair value on marketable securities	(6)					(6)
Translation adjustment	7,954				7,954
Net loss	(19,165)			(19,165)
Ending balance at Jan. 31, 2013	202,201	327	216,359	(12,658)	(1,856)	30	(1)
Ending balance, Shares at Jan. 31, 2013		32,510,326					(39,784)
Issuance of common stock pursuant to exercise of stock options	1,058	1	1,057
Issuance of common stock pursuant to exercise of stock options, Shares	118,528	118,529
Issuance of common stock pursuant to vesting of restricted stock units		1	(1)
Issuance of common stock pursuant to vesting of restricted stock units, Shares		205,928
Issuance of common stock pursuant to deferred consideration	1,559	1	1,558
Issuance of common stock pursuant to deferred consideration, Shares		202,888
Stock-based compensation expense	2,959		2,959
Change in fair value on marketable securities	(12)					(12)
Translation adjustment	(294)				(294)
Net loss	(3,030)			(3,030)
Ending balance at Jan. 31, 2014	204,441	330	221,932	(15,688)	(2,150)	18	(1)
Ending balance, Shares at Jan. 31, 2014		33,037,671					(39,784)
Issuance of common stock pursuant to exercise of stock options, Shares	0
Issuance of common stock pursuant to vesting of restricted stock units		3	(3)
Issuance of common stock pursuant to vesting of restricted stock units, Shares		287,485
Purchase of treasury shares	(5,498)		(5,498)
Purchase of treasury shares, Shares	591,520						(591,520)
Retirement of shares	(6)	(6)
Retirement of shares, Shares		(591,520)					591,520
Stock-based compensation expense	3,220		3,220
Change in fair value on marketable securities	25					25
Translation adjustment	(3,647)				(3,647)
Net loss	(27,484)			(27,484)
Ending balance at Jan. 31, 2015	$ 171,051	$ 327	$ 219,651	$ (43,172)	$ (5,797)	$ 43	$ (1)
Ending balance, Shares at Jan. 31, 2015		32,733,636					(39,784)