Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total USD ($)	2011 Employee Stock Purchase Plan USD ($)	Deferred Stock Units (DSUs) USD ($)	Stock Options USD ($)	Restricted Stock Units (RSUs) USD ($)	Common Stock USD ($)	Common Stock 2011 Employee Stock Purchase Plan	Common Stock Deferred Stock Units (DSUs)	Common Stock Stock Options	Common Stock Restricted Stock Units (RSUs)	Capital In Excess of Par Value USD ($)	Capital In Excess of Par Value 2011 Employee Stock Purchase Plan USD ($)	Capital In Excess of Par Value Deferred Stock Units (DSUs) USD ($)	Capital In Excess of Par Value Stock Options USD ($)	Capital In Excess of Par Value Restricted Stock Units (RSUs) USD ($)	Cumulative Other Comprehensive Income (Loss) USD ($)	Accumulated Deficit USD ($)	Parent USD ($)	Parent 2011 Employee Stock Purchase Plan USD ($)	Parent Deferred Stock Units (DSUs) USD ($)	Parent Stock Options USD ($)	Parent Restricted Stock Units (RSUs) USD ($)	Noncontrolling Interest USD ($)
Noncontrolling interest, beginning balance at Mar. 31, 2010																							$ 0
Total equity, beginning balance at Mar. 31, 2010	51,228
Equity, beginning balance at Mar. 31, 2010						11					48,887					89	2,241	51,228
Shares outstanding, beginning balance at Mar. 31, 2010						10,595,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(767)																(767)	(767)
Net loss attributable to noncontrolling interest	0
Unrealized gain (loss) on foreign currency translation	474															474		474
Unrealized loss on investments, net of tax	(33)															(33)		(33)
Common stock issued pursuant to stock plans	3,009										3,009							3,009
Common stock issued pursuant to stock plans (shares)						802,000		67,000
Common stock used to pay for option exercises	(1,173)													(1,173)							(1,173)
Common stock used to pay option exercises (shares)									(48,000)
Common stock used to pay for taxes associated with option exercises	(2,224)			(2,152)										(2,224)	(2,152)						(2,224)	(2,152)
Common stock used to pay for taxes associated with option exercises (shares)									(89,000)	(84,000)
Contingent equity consideration	2,000										2,000							2,000
Stock-based compensation expense			1,201	1,160	2,397								1,201	1,160	2,397					1,201	1,160	2,397
Income tax effect from stock-based compensation	1,253										1,253							1,253
Noncontrolling interest, ending balance at Mar. 31, 2011																							0
Total equity, ending balance at Mar. 31, 2011	56,373
Equity, ending balance at Mar. 31, 2011						11					54,358					530	1,474	56,373
Shares outstanding, ending balance at Mar. 31, 2011						11,243,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(6,426)																(6,426)	(6,426)
Net loss attributable to noncontrolling interest	0
Unrealized gain (loss) on foreign currency translation	(284)															(284)		(284)
Unrealized loss on investments, net of tax	95															95		95
Common stock issued pursuant to stock plans	1,008										1,008							1,008
Common stock issued pursuant to stock plans (shares)						159,000
Common stock used to pay for option exercises				(746)										(746)							(746)
Common stock used to pay option exercises (shares)									(40,000)
Common stock used to pay for taxes associated with option exercises				(210)										(210)							(210)
Common stock used to pay for taxes associated with option exercises (shares)									(12,000)
Common stock issued in satisfaction of contingent payouts related to acquisition						33,000
Stock-based compensation expense			792	3,451	711								792	3,451	711					792	3,451	711
Common stock repurchased (shares)						(305,000)
Common stock repurchased	(4,341)										(4,341)							(4,341)
Income tax effect from stock-based compensation	102										102							102
Noncontrolling interest, ending balance at Mar. 31, 2012	0																						0
Total equity, ending balance at Mar. 31, 2012	50,525
Equity, ending balance at Mar. 31, 2012	50,525					11					55,125					341	(4,952)	50,525
Shares outstanding, ending balance at Mar. 31, 2012						11,078,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(22,617)																(22,617)	(22,617)
Net loss attributable to noncontrolling interest	(61)																						(61)
Unrealized gain (loss) on foreign currency translation	(230)															(230)		(230)
Unrealized loss on investments, net of tax	(80)															(80)		(80)
Common stock issued pursuant to stock plans	322										322							322
Common stock issued pursuant to stock plans (shares)						50,000
Common stock used to pay for option exercises	(63)													(63)							(63)
Common stock used to pay option exercises (shares)									(3,000)
Common stock used to pay for taxes associated with option exercises				(53)										(53)							(53)
Common stock used to pay for taxes associated with option exercises (shares)									(3,000)
Common stock issued pursuant to employee stock purchase plan		511										511							511
Common stock issued pursuant to employee stock purchase plan (shares)		37,328					37,000
Common stock issued in satisfaction of contingent payouts related to acquisition						33,000
Common stock issued to DISH Network	13,237					1					13,236							13,237
Common stock issued to DISH Network (shares)						700,000
Investment in consolidated joint venture by noncontrolling interest	1,050																						1,050
Stock-based compensation expense		172	650	5,252	366							172	650	5,252	366				172	650	5,252	366
Income tax effect from stock-based compensation	(10)										(10)							(10)
Noncontrolling interest, ending balance at Mar. 31, 2013	989																						989
Total equity, ending balance at Mar. 31, 2013	48,971
Equity, ending balance at Mar. 31, 2013	$ 47,982					$ 12					$ 75,508					$ 31	$ (27,569)	$ 47,982
Shares outstanding, ending balance at Mar. 31, 2013						11,892,000