Stock Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended			80 Months Ended
	Nov. 06, 2014	Mar. 31, 2017	Mar. 31, 2016	Aug. 31, 2012	Mar. 31, 2018	Aug. 09, 2012	Aug. 31, 2011
Stock Repurchase Program
Number of shares acquired			656,000		3,422,000
Increase in the authorized amount for repurchase of common stock	$ 3,000
Value of common stock repurchased		$ 4,826	$ 1,195		$ 5,600
Average price per share of common stock repurchased (in dollars per share)					$ 1.63
Value of common stock available for repurchase under current program					$ 1,700
Maximum
Stock Repurchase Program
Value of common stock approved under stock repurchase program						$ 3,000
August 2011 Program
Stock Repurchase Program
Number of shares acquired				964,000
Value of common stock repurchased				$ 1,300
Value of remaining funds cancelled under initial stock repurchase program						$ 1,700
August 2011 Program | Maximum
Stock Repurchase Program
Value of common stock approved under stock repurchase program							$ 3,000