Supporting Financial Information | Supporting Financial Information Accounts receivable (in thousands) March 31, September 30, Ref 2018 2017 Billed receivables $ 11,989 $ 11,862 Unbilled receivables 349 49 Total accounts receivable 12,338 11,911 Less: Allowance for doubtful accounts (a) — — Accounts receivable, net $ 12,338 $ 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 both March 31, 2018 and September 30, 2017 . Other current assets (in thousands) March 31, September 30, Ref 2018 2017 Prepaid insurance and benefits $ 605 $ 240 Other receivables and prepaid expenses 340 358 Other current assets $ 945 $ 598 Equipment and improvements, net (in thousands) March 31, September 30, Ref 2018 2017 Furniture and equipment $ 326 $ 331 Computer equipment 810 715 Computer software (a) 1,607 1,108 Leasehold improvements 66 66 Total fixed assets 2,809 2,220 Less accumulated depreciation and amortization (1,014 ) (829 ) Equipment and improvements, net (b) $ 1,795 $ 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 March 31, 2018 and September 30, 2017 , respectively, of software licenses and implementation labor related to application development. The asset was placed in service effective 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 $119 thousand and $85 thousand for the three months ended March 31, 2018 and 2017 respectively and $185 thousand and $170 thousand for the six months ended March 31, 2018 and 2017 respectively. Goodwill and Intangibles (in thousands) as of March 31, 2018 Ref Goodwill Customer Relationships (a) Non Compete Agreement (a) Trade Name (a) Total Gross Balance at September 30, 2017 $ 25,989 $ 16,626 $ 480 $ 517 $ 43,612 Accumulated amortization at September 30, 2017 — (2,355 ) (68 ) (73 ) (2,496 ) Current period amortization — (831 ) (24 ) (26 ) (881 ) Total accumulated amortization — (3,186 ) (92 ) (99 ) (3,377 ) Net balance at March 31, 2018 $ 25,989 $ 13,440 $ 388 $ 418 $ 40,235 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 March 31, 2018 and 2017 , respectively. Estimated amortization expense for future years: (in thousands) Year 1 $ 1,762 Year 2 1,762 Year 3 1,762 Year 4 1,762 Year 5 1,762 Thereafter 5,436 $ 14,246 Accounts payable, accrued expenses and other current liabilities (in thousands) March 31, September 30, Ref 2018 2017 Accounts payable $ 4,914 $ 5,205 Accrued benefits 1,857 1,831 Accrued bonus and incentive compensation 1,029 1,544 Accrued workers compensation insurance 1,626 1,598 Other accrued expenses 510 717 Accounts payable, accrued expenses, and other current liabilities $ 9,936 $ 10,895 Debt obligations (in thousands) March 31, September 30, Ref 2018 2017 Bank term loan (a) $ 14,896 $ 19,688 Less unamortized debt issuance costs (823 ) (961 ) Net bank debt obligation 14,073 18,727 Less current portion of bank debt obligations (3,622 ) (6,518 ) Long term portion of bank debt obligation $ 10,451 $ 12,209 Ref (a): Maturity of the bank debt obligation as follows, in thousands: Year 1 $ 3,750 Year 2 3,750 Year 3 3,750 Year 4 3,646 Total bank debt obligation $ 14,896 Interest expense (in thousands) (in thousands) Three Months Ended Six Months Ended March 31, March 31, Ref 2018 2017 2018 2017 Interest expense (a) $ (208 ) $ (215 ) $ (427 ) $ (440 ) Amortization of debt financing costs as interest expense (b) (67 ) (67 ) (132 ) (127 ) Change in fair value of derivative financial instruments — 27 — (52 ) Other income (expense), net 14 20 — Interest expense, net $ (261 ) (255 ) $ (539 ) $ (619 ) Ref (a): Interest expense on borrowing Ref (b): Amortizations of expenses related to securing financing |