CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2013
Accounts receivable, allowances for doubtful accounts	$ 573	$ 306	$ 247
Class A Common Stock [Member]
Common Stock, par value per share	$ 0.0001	$ 0.0001	$ 0.0001
Common Stock, shares authorized	139,500	139,500	139,500
Common Stock, shares outstanding	65,537	65,229	63,947
Class B Common Stock [Member]
Common Stock, par value per share	$ 0.0001	$ 0.0001	$ 0.0001
Common Stock, shares authorized	40,500	40,500	40,500
Common Stock, shares outstanding	4,396	4,396	4,396