Supporting Financial Information | Supporting Financial Information Accounts receivable (in thousands) June 30, September 30, Ref 2018 2017 Billed receivables $ 12,298 $ 11,862 Unbilled receivables 122 49 Total accounts receivable 12,420 11,911 Less: Allowance for doubtful accounts (a) — — Accounts receivable, net $ 12,420 $ 11,911 Ref (a): Accounts receivable are non-interest bearing, unsecured and carried at net realizable value. We evaluate our receivables on a quarterly basis and determine whether an allowance is appropriate based on specific collection issues. No allowance for doubtful accounts was deemed necessary at either June 30, 2018 or September 30, 2017 . Other current assets (in thousands) June 30, September 30, Ref 2018 2017 Prepaid insurance and benefits $ 611 $ 240 Other receivables and prepaid expenses 245 358 Other current assets $ 856 $ 598 Equipment and improvements, net (in thousands) June 30, September 30, Ref 2018 2017 Furniture and equipment $ 326 $ 331 Computer equipment 759 715 Computer software (a) 1,640 1,108 Leasehold improvements 66 66 Total fixed assets 2,791 2,220 Less accumulated depreciation and amortization (1,161 ) (829 ) Equipment and improvements, net (b) $ 1,630 $ 1,391 Ref (a): The Company implemented a new Enterprise Resource Planning system on January 1, 2018. Capitalized costs include $1.2 million and $0.7 million as of June 30, 2018 and September 30, 2017 , respectively, of software licenses and implementation labor related to application development. The asset was placed in service as of January 1, 2018 with an estimated useful life of 5 years. Ref (b): Equipment and improvements are stated at cost. Depreciation and amortization are provided using the straight-line method over the estimated useful asset lives ( 3 to 7 years) and the shorter of the initial lease term or estimated useful life for leasehold improvements. Maintenance and repair costs are expensed as incurred. Depreciation of equipment was $147 thousand and $69 thousand for the three months ended June 30, 2018 and 2017 , respectively, and $332 thousand and $239 thousand for the nine months ended June 30, 2018 and 2017 , respectively. Intangible Assets (in thousands) June 30, September 30, Ref 2018 2017 Intangible assets (a) Customer contracts and related customer relationships $ 16,626 $ 16,626 Covenants not to compete 480 480 Trade name 517 517 Intangible assets 17,623 17,623 Less accumulated amortization Customer contracts and related customer relationships (3,602 ) (2,355 ) Covenants not to compete (104 ) (68 ) Trade name (112 ) (73 ) Total accumulated amortization (3,818 ) (2,496 ) Intangible assets, net $ 13,805 $ 15,127 Ref (a): Intangible assets subject to amortization. The intangibles are amortized on a straight-line basis over their estimated useful lives of 10 years . Total amount of amortization expense was $0.4 million and $0.4 million for the three months ended June 30, 2018 and 2017 , respectively, and $1.3 million and $1.0 million for the nine months ended June 30, 2018 and 2017 , respectively. Estimated amortization expense for future years: (in thousands) Remaining Fiscal 2018 $ 441 Fiscal 2019 1,762 Fiscal 2020 1,762 Fiscal 2021 1,762 Fiscal 2022 1,762 Fiscal 2023 1,762 Thereafter 4,554 $ 13,805 Accounts payable, accrued expenses and other current liabilities (in thousands) June 30, September 30, Ref 2018 2017 Accounts payable $ 3,890 $ 5,205 Accrued benefits 2,263 1,831 Accrued bonus and incentive compensation 1,509 1,544 Accrued workers compensation insurance 2,182 1,598 Other accrued expenses 631 717 Accounts payable, accrued expenses, and other current liabilities $ 10,475 $ 10,895 Debt obligations (in thousands) June 30, September 30, Ref 2018 2017 Bank term loan (a) $ 13,958 $ 19,688 Less unamortized debt issuance costs (823 ) (961 ) Net bank debt obligation 13,135 18,727 Less current portion of bank debt obligations (3,633 ) (6,518 ) Long term portion of bank debt obligation $ 9,502 $ 12,209 Ref (a): Maturity of the bank debt obligation as follows, in thousands: Year 1 $ 3,750 Year 2 3,750 Year 3 6,458 Total bank debt obligation $ 13,958 Interest expense (in thousands) (in thousands) Three Months Ended Nine Months Ended June 30, June 30, Ref 2018 2017 2018 2017 Interest expense (a) $ (192 ) $ (219 ) $ (619 ) $ (662 ) Amortization of debt financing costs as interest expense (b) (70 ) (70 ) (202 ) (194 ) Change in fair value of derivative financial instruments — 3 — (49 ) Other income (expense), net — 17 20 17 Interest expense, net $ (262 ) $ (269 ) $ (801 ) $ (888 ) Ref (a): Interest expense on borrowing Ref (b): Amortizations of expenses related to securing financing |