Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019
Consolidated Balance Sheets
Accounts receivable, allowance (in dollars)	$ 1,541	$ 2,253
Series A convertible preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Series A convertible preferred stock, shares authorized	108,000	108,000
Series A convertible preferred stock, shares issued	108,000	108,000
Series A convertible preferred stock, shares outstanding	108,000	108,000
Series A convertible preferred stock, redemption amount	$ 108,000	$ 108,000
Series A convertible preferred stock, liquidation preference	$ 108,000	$ 108,000
Undesignated preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Undesignated preferred stock, shares authorized	5,000,000	5,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	120,000,000	120,000,000
Common stock, shares issued	33,518,389	33,012,775
Common stock, shares outstanding	30,132,825	30,132,776
Treasury stock, common shares	3,385,564	2,879,999