Revenue Recognition - Additional Information (Details) - USD ($)	3 Months Ended				6 Months Ended	9 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2019
Disaggregation Of Revenue [Line Items]
Deferred contract liabilities	$ 100,000					$ 100,000		$ 0
Deferred contract costs	0					0		0
Revenue	6,975,000	$ 9,517,000	$ 9,083,000	$ 12,153,000	$ 18,600,000	25,575,000	$ 34,457,000
Cost of revenue recognized from deferred contract cost	0			35,000		0	27,000
Value of notes with customer	939,000					939,000		$ 3,472,000
Cost of revenue	14,639,000	18,002,000	$ 15,208,000	15,283,000	33,210,000	47,849,000	45,840,000
Product
Disaggregation Of Revenue [Line Items]
Revenue		0
Partially financed product sale		12,500,000
Cost of revenue		0
Payments received from customer						$ 3,800,000
Secured Promissory Note
Disaggregation Of Revenue [Line Items]
Value of notes with customer		$ 10,000,000.0			$ 10,000,000.0
Term of the notes		3 years
Monthly principal and interest payments		$ 300,000
Frequency of payments		monthly				monthly
Deferred Contract Liability
Disaggregation Of Revenue [Line Items]
Revenue	$ 0			$ 42,000		$ 0	$ 100,000