Basic and Diluted Net Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Numerator:
Net income (loss)	$ 12,278	$ (8,600)	$ (4,925)	$ (38,456)
Weighted-average shares outstanding:
Basic (in shares)	46,606	46,081	46,469	45,953
Assumed conversion of employee stock grants (in shares)	2,122	0	0	0
Assumed conversion of warrants (in shares)	6,568	0	0	0
Diluted (in shares)	55,296	46,081	46,469	45,953
Net income (loss) per basic share (in usd per share)	$ 0.26	$ (0.19)	$ (0.11)	$ (0.84)
Net income (loss) per diluted share (in usd per share)	$ 0.22	$ (0.19)	$ (0.11)	$ (0.84)
Common stock equivalents that could potentially dilute net income per basic share in the future, but were not included in the computation of diluted earnings per share because the impact would have been antidilutive
Document Period End Date			Dec. 31, 2016
Common stock equivalents (in shares)	800	3,257	2,760	3,247
Assumed conversion of warrants
Common stock equivalents that could potentially dilute net income per basic share in the future, but were not included in the computation of diluted earnings per share because the impact would have been antidilutive
Common stock equivalents (in shares)	0	5,168	5,913	5,261