Description of Business and Summary of Significant Accounting Policies (Details)		12 Months Ended
	Jun. 13, 2019 USD ($) shares	Mar. 31, 2020 USD ($) customer	Mar. 31, 2019 USD ($) customer	Mar. 31, 2018 USD ($) customer	Apr. 01, 2019 USD ($)	Mar. 31, 2017 USD ($)
Significant accounting policies
Proceeds from Issuance of Common Stock		$ 26,751,000
Revenue Recognition
Prepaid expenses and other current assets		2,149,000	$ 1,367,000
Total assets		101,957,000	57,955,000
Deferred revenue		5,963,000	4,883,000
Total liabilities		38,830,000	23,900,000
Accumulated deficit		(117,153,000)	(111,543,000)
Total liabilities and stockholders' equity		101,957,000	57,955,000
Contract Fulfillment Costs
Capitalized contract fulfillment costs		$ 1,236,000	172,000
Practical Expedients and Exemptions
Practical expedients not disclosing performance obligation		true
Practical expedients incremental cost		true
Cash, Cash Equivalents and Restricted Cash
Restricted cash related to the shares purchased		$ 146,000
Cash and cash equivalents		14,217,000	7,071,000
Restricted cash		146,000
Cash, cash and cash equivalents and Restricted cash		14,363,000	7,071,000	$ 10,152,000		$ 18,201,000
Goodwill and Long-Lived Assets
Impairment of long-lived and intangible assets		0	0
Income Taxes
Valuation allowance on deferred tax assets		14,163,000	$ 12,250,000
Recent Accounting Pronouncements
Lease liabilities		13,930,000
Operating lease right-of-use-assets		$ 13,044,000
Total revenues
Concentration of Credit Risk
Percentage of concentration risk			1.00%	2.00%
Total revenues | Customer | One individual customer
Concentration of Credit Risk
Number of customers | customer			1	1
Percentage of concentration risk			24.00%	22.00%
Total revenues | Customer | No individual customer
Concentration of Credit Risk
Number of customers | customer		0
Percentage of concentration risk		10.00%
Total accounts receivable | Customer | No individual customer
Concentration of Credit Risk
Number of customers | customer		0	0
Minimum
Warranty
Warranty period		1 year
Minimum | Property and equipment
Property and Equipment, net
Useful life		3 years
Minimum | Total accounts receivable | Customer | No individual customer
Concentration of Credit Risk
Percentage of concentration risk		10.00%	10.00%
Maximum
Warranty
Warranty period		3 years
Maximum | Property and equipment
Property and Equipment, net
Useful life		8 years
ASU 2016-02
Recent Accounting Pronouncements
Lease liabilities					$ 14,200,000
Operating lease right-of-use-assets					13,400,000
Derecognition of deferred rent					$ 827,000
Stockholders of AGI
Significant accounting policies
Payments to Acquire Businesses, Gross	$ 6,200,000
Underwritten Public Offering
Significant accounting policies
Stock Issued During Period, Shares, New Issues | shares	6,182,797
Proceeds from Issuance of Common Stock	$ 26,800,000