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Supplemental Balance Sheet Disclosures | 6 Months Ended
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Mar. 31, 2022
Supplemental Balance Sheet Disclosures |
Supplemental Balance Sheet Disclosures | 2. Supplemental Balance Sheet Disclosures Inventories Inventories are stated at the lower of cost (first-in, first-out) or net realizable value, net of write-downs for excess and obsolete inventory, and consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | September 30,
​ |  | 2022 |  | 2021
Raw materials |  | $ | 3,751,366 |  | $ | 3,729,692
Work-in-process | ​ |  | 732,778 | ​ |  | 629,814
Finished goods | ​ |  | 205,117 | ​ |  | 185,886
​ |  | $ | 4,689,261 |  | $ | 4,545,392
​ Prepaid expenses and other current assets Prepaid expenses and other current assets consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | September 30,
​ |  | 2022 |  | 2021
Prepaid insurance |  | $ | 544,254 | ​ | $ | 318,138
Other | ​ |  | 333,777 | ​ |  | 514,938
​ |  | $ | 878,031 | ​ | $ | 833,076
​ Property and equipment Property and equipment, net consists of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | September 30,
​ |  | 2022 |  | 2021
Computer equipment | ​ | $ | 2,294,387 | ​ | $ | 2,309,053
Corporate airplanes | ​ |  | 5,601,039 | ​ |  | 5,601,039
Furniture and office equipment | ​ |  | 977,735 | ​ |  | 970,725
Manufacturing facility | ​ |  | 5,889,491 | ​ |  | 5,889,491
Equipment | ​ |  | 5,622,877 | ​ |  | 5,545,529
Land | ​ | ​ | 1,021,245 | ​ | ​ | 1,021,245
​ | ​ |  | 21,406,774 | ​ |  | 21,337,082
Less: accumulated depreciation and amortization | ​ |  | (13,359,428) | ​ |  | (13,193,599)
​ |  | $ | 8,047,346 |  | $ | 8,143,483
​ Depreciation and amortization related to property and equipment was $88,122 and $95,844 for the three-month periods ended March 31, 2022 and 2021, respectively. The corporate airplanes are utilized primarily in support of product development. The Pilatus PC-12 airplane, one of the Company’s two corporate airplanes, has been depreciated to its estimated salvage value. Depreciation and amortization related to property and equipment was approximately $180,494 and $188,895 for the six-month periods ended March 31, 2022 and 2021, respectively. Other assets Other assets consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | September 30,
​ |  | 2022 |  | 2021
Intangible assets, net of accumulated amortization of $635,095 and $634,032 at March 31, 2022 and September 30, 2021 |  | $ | 61,411 |  | $ | 62,474
Operating lease right-of-use asset | ​ | ​ | 35,741 | ​ | ​ | 42,976
Other non-current assets | ​ | ​ | 76,257 | ​ |  | 82,834
​ |  | $ | 173,409 |  | $ | 188,284
​ Intangible assets consist of licensing and certification rights which are amortized over a defined number of units. No impairment charges were recorded in the six-month periods ended March 31, 2022 and 2021. Intangible asset amortization expense was $1,063 and $12,559 for the three-month periods ended March 31, 2022 and 2021, respectively. Intangible asset amortization expense was $1,063 and $32,473 for the six-month periods ended March 31, 2022 and 2021, respectively. The timing of future amortization expense is not determinable because the intangible assets are being amortized over a defined number of units. Other non-current assets as of March 31, 2022 and September 30, 2021 include the security deposit for an airplane hangar and a deposit for medical claims required under the Company’s medical plan. In addition, other non-current assets as of March 31, 2022 and September 30, 2021 includes $958 and $7,535, respectively, of prepaid software licenses that will be earned upon the shipment of a certain product to a customer. Other non-current assets amortization expense was $3,557 and $2,392 for the three-month periods ended March 31, 2022 and 2021, respectively. Other non-current assets amortization expense was $6,577 and $3,110 for the six-month periods ended March 31, 2022 and 2021, respectively. Accrued expenses Accrued expenses consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | September 30,
​ |  | 2022 |  | 2021
Warranty |  | $ | 585,867 |  | $ | 589,260
Salary, benefits and payroll taxes | ​ |  | 366,801 | ​ |  | 385,287
Professional fees | ​ |  | 129,584 | ​ |  | 163,130
Income tax | ​ | ​ | 164,715 | ​ | ​ | 104,737
Operating lease | ​ | ​ | 13,951 | ​ | ​ | 14,296
Other | ​ | ​ | 297,243 | ​ | ​ | 174,405
​ |  | $ | 1,558,161 |  | $ | 1,431,115
​ Warranty cost and accrual information for the three-month period ended March 31, 2022 is highlighted below: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ending | ​ | Six Months Ending
​ |  | March 31, 2022 |  | March 31, 2022
Warranty accrual, beginning of period |  | $ | 596,436 | ​ | $ | 589,260
Accrued expense | ​ |  | 32,054 | ​ |  | 64,644
Warranty cost | ​ |  | (42,623) | ​ |  | (68,037)
Warranty accrual, end of period |  | $ | 585,867 | ​ | $ | 585,867
​

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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