Revenue - Contract Balances (Details) - USD ($) |
3 Months Ended | 12 Months Ended |
---|---|---|
Dec. 31, 2020 |
Sep. 30, 2020 |
|
Change In Contract With Customer, Assets [Roll Forward] | ||
Contract assets - Beginning balance | $ 11,997,000 | |
Additional revenue recognized over-time | 14,520,000 | |
Less amounts billed to the customers | (14,591,000) | |
Contract assets - Ending balance | 11,926,000 | $ 11,997,000 |
Change In Contract With Customer, Liability [Roll Forward] | ||
Contract liabilities (included within Accrued liabilities) - Beginning balance | (636,000) | |
Payments received in advance of performance obligations | (155,000) | |
Performance obligations satisfied | 66,000 | |
Contract liabilities (included within Accrued liabilities) - Ending balance | (725,000) | (636,000) |
Impairment loss on contract assets | $ 0 | $ 0 |