Loss per Share - Amounts Used in Computing (Loss) Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Numerator:
Net loss	$ (26,992)	$ (2,582)	$ (2,918)	$ (1,575)	$ (3,589)	$ (4,048)	$ (3,791)	$ (1,736)	$ (34,067)	$ (13,164)	$ (8,350)
Denominator:
Weighted average shares outstanding - basic and diluted									23,233	23,037	22,801
Loss per share - basic and diluted:
Net loss per share (in dollars per share)	$ (1.16)	$ (0.11)	$ (0.13)	$ (0.07)	$ (0.15)	$ (0.18)	$ (0.16)	$ (0.08)	$ (1.47)	$ (0.57)	$ (0.37)
Anti-dilutive stock options, SSARs, restricted shares and performance shares									1,510	1,433	756