Additional Balance Sheet Information Accounts receivable, net (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019
Additional Balance Sheet Information [Abstract]
Accounts receivable, net	$ 25,690	$ 27,000
Allowance for doubtful accounts receivable	$ 760	$ 788

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Name:	us-gaap_AccountsReceivableNetCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant