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Description of Business and Summary of Significant Accounting Policies (Details)			3 Months Ended			6 Months Ended		12 Months Ended
	May 05, 2020 USD ($)	Apr. 30, 2020 USD ($)	Sep. 30, 2020 USD ($) customer	Jun. 30, 2020 USD ($)	Sep. 30, 2019 USD ($) customer	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2020 USD ($) customer	Mar. 31, 2019 USD ($)
Significant accounting policies
Restructuring charges		$ 1,500,000	$ 0		$ 0	$ 619,000	$ 0
Contract Fulfillment Costs
Capitalized contract fulfillment costs			2,073,000			2,073,000		$ 1,236,000
Cash, Cash Equivalents and Restricted Cash
Restricted cash related to the shares purchased			146,000			146,000		146,000
Cash and cash equivalents			15,623,000			15,623,000		14,217,000
Restricted cash			146,000			146,000		146,000
Cash, cash and cash equivalents and Restricted cash			15,769,000		$ 9,457,000	15,769,000	9,457,000	$ 14,363,000	$ 7,071,000
Goodwill and Long-Lived Assets
Loss on impairment of goodwill						0
Impairment charges				$ 313,000
Warranty
Cash paid in business acquisition, net of cash acquired			$ 0			$ 0	$ 5,581,000
No individual customer
Concentration of Credit Risk
Number of customers \| customer			0					0
Net sales and contract revenues \| Customer \| No individual customer
Concentration of Credit Risk
Number of customers \| customer					0
Minimum
Warranty
Warranty period						1 year
Minimum \| Property and equipment
Property and Equipment, net
Useful life						3 years
Minimum \| Net sales and contract revenues \| Customer \| No individual customer
Concentration of Credit Risk
Percentage of concentration risk			10.00%		10.00%
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
Agriculture and Weather Analytics segment
Significant accounting policies
Restructuring charges		$ 1,500,000
Agriculture and Weather Analytics segment \| Held for sale
Significant accounting policies
Total purchase consideration	$ 12,000,000.0		$ 12,000,000.0			$ 12,000,000.0
Proceeds from Divestiture of Businesses	10,500,000					$ 9,440,000
Agriculture and Weather Analytics segment \| Held for sale \| 12-month anniversaries of the closing date
Significant accounting policies
Amount receivable from sale of segment	1,450,000
Agriculture and Weather Analytics segment \| Held for sale \| 18-month anniversaries of the closing date
Significant accounting policies
Amount receivable from sale of segment	$ 50,000