Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019
Allowance for doubtful accounts	$ 5,704	$ 5,704
Unamortized debt issuance costs	$ 2,119	$ 2,293
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	58,283,000	57,964,000
Common stock, shares outstanding	57,779,000	57,490,000
Redeemable Convertible Preferred Stock [Member]
Mezzanine equity, par value	$ 0.01	$ 0.01
Mezzanine equity, shares authorized	47,070,000	47,070,000
Mezzanine equity, shares issued	44,170,000	44,170,000
Mezzanine equity, shares outstanding	22,385,000	22,611,000