NOTE 4—FAIR VALUE OF FINANCIAL INSTRUMENTS

The valuation techniques required to determine fair value are based upon observable and unobservable inputs. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect internal market assumptions. The two types of inputs create the following fair value hierarchy:

Level 1 - Quoted prices for identical instruments in active markets.

Level 2 - Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations whose inputs are observable or whose significant value drivers are observable.

Level 3 - Significant inputs to the valuation model are unobservable.

The following table presents assets and liabilities measured and recorded at fair value on our balance sheets on a recurring basis (in thousands):


	September 30, 2018								September 30, 2017
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Assets
Cash equivalents	$	9,000	$	—	$	—	$	9,000	$	8,501	$	—	$	—	$	8,501
Current derivative assets		—		1,803		—		1,803		—		2,591		—		2,591
Noncurrent derivative assets		—		314		—		314		—		1,128		—		1,128
Total assets measured at fair value	$	9,000	$	2,117	$	—	$	11,117	$	8,501	$	3,719	$	—	$	12,220
Liabilities
Current derivative liabilities		—		1,657		—		1,657		—		3,456		—		3,456
Noncurrent derivative liabilities		—		75		—		75		—		1,128		—		1,128
Contingent consideration to seller of Deltenna		—		—		1,081		1,081		—		—		1,376		1,376
Contingent consideration to seller of Shield Aviation		—		—		5,618		5,618		—		—		—		—
Contingent consideration to seller of TeraLogics - contract extensions		—		—		—		—		—		—		800		800
Contingent consideration to seller of TeraLogics - revenue targets		—		—		1,750		1,750		—		—		2,450		2,450
Contingent consideration to seller of H4 Global		—		—		665		665		—		—		591		591
Total liabilities measured at fair value	$	—	$	1,732	$	9,114	$	10,846	$	—	$	4,584	$	5,217	$	9,801

The fair value of certain of our cash equivalents are based upon quoted prices for identical instruments in active markets. The fair value of our other cash equivalents and our available for sale marketable securities is based upon a discounted cash flow model and approximate cost. The marketable securities in the rabbi trust are carried at fair value, which is based upon quoted market prices for identical securities. Derivative financial instruments are measured at fair value, the material portions of which are based on active or inactive markets for identical or similar instruments or model-derived valuations whose inputs are observable. Where model-derived valuations are appropriate, we use the applicable credit spread as the discount rate. Credit risk related to derivative financial instruments is considered minimal and is managed by requiring high credit standards for counterparties and through periodic settlements of positions.

The fair value of contingent consideration liabilities to the sellers of businesses that we have acquired are revalued to their fair value each period and any increase or decrease is recorded into selling, general and administrative expense. Any changes in the assumed timing and amount of the probability of payment scenarios could impact the fair value.

The Deltenna contingent consideration is based upon revenue targets and one of the TeraLogics contingent consideration measurements is based upon revenue targets. Until the contingencies are resolved for these measurements, the fair values of these contingent consideration liabilities are valued using a real option approach. Under this approach, each payment was modeled using long digital options written on the underlying revenue metric. The strike price for each option is the respective revenue as specified in the related agreement, and the spot price is calibrated to the revenue forecast by calculating the present value of the corresponding projected revenues using a risk-adjusted discount rate. The volatility for the underlying revenue metrics was based upon analysis of comparable guideline public companies and the volatility factor used in the September 30, 2018 valuation was 53% for Deltenna. The volatility factor used in the September 30, 2017 valuations was 40% for Deltenna and 15% for TeraLogics. The risk-free rate was selected based on the quoted yields for U.S. Treasury securities with terms matching the earn-out payment period. At September 30, 2018, the contingencies were resolved for the TeraLogics revenue earn-out and the liability at September 30, 2018 represents the amount earned as of that date.

The fair value of the portion of the TeraLogics contingent consideration that is based on customer execution of contract extensions was estimated using a probability weighted approach. This portion of TeraLogics’ contingent consideration was fully paid out as of September 30, 2018 based on its achievement of the contract extensions.

The fair value of the Shield contingent consideration was estimated based on Monte Carlo simulations. Under the purchase agreement, we will pay the sellers up to $10.0 million if Shield meets certain sales goals from the date of acquisition through July 31, 2025. The fair value of the contingent consideration was determined based upon a probability distribution of values based on 100,000 iterations. Key inputs for the simulation include projected revenues, assumed discount rates for projected revenue and cash flows, and volatility. The volatility and revenue risk adjustment factors used as of September 30, 2018 were 20% and 14.5%, respectively, and were determined based on analysis of publicly traded comparable companies. The discount rate used as of September 30, 2018 was based on our expected borrowing rate under our financing arrangements, which was determined to be 3.9% at September 30, 2018.

The maximum remaining payout to the sellers of H4 Global is $3.3 million at September 30, 2018, and is based upon the value of contracts entered into over the five-year period ending September 30, 2020. The fair value of the H4 Global contingent consideration was estimated using a probability weighted approach. Subject to the terms and conditions of the H4 Global purchase agreement, contingent consideration will be paid over a five year term that commenced on October 1, 2015 and ends on September 30, 2020. The payments will be calculated based on the award of certain contracts during the specified period. The fair value of the contingent consideration was determined by applying probabilities to different scenarios, and summing the present value of any future payments.

The inputs to each of the contingent consideration fair value models include significant unobservable inputs and therefore represent Level 3 measurements within the fair value hierarchy. Significant judgment is employed in determining the appropriateness of these assumptions as of the acquisition dates and each subsequent period. Accordingly, changes in the assumptions described above can materially impact the amount of contingent consideration expense we record in any period.

As of September 30, 2018, the following table summarizes the change in fair value of our Level 3 contingent consideration liability (in thousands):


		DTECH		H4		TeraLogics (Contract Extensions)		TeraLogics (Revenue Targets)		GATR		Deltenna		Shield Aviation		Total
Balance as of September 30, 2016	$	2,000	$	567	$	1,400	$	4,100	$	3,200	$	—	$	—	$	11,267
Initial measurement recognized at acquisition		—		—		—		—		—		1,328		—		1,328
Cash paid to seller		—		—		(1,000)		(2,500)		—		—		—		(3,500)
Total remeasurement (gain) loss recognized in earnings		(2,000)		24		400		850		(3,200)		48		—		(3,878)
Balance as of September 30, 2017	$	—	$	591	$	800	$	2,450	$	—	$	1,376	$	—	$	5,217
Initial measurement recognized at acquisition		—		—		—		—		—		—		5,618		5,618
Cash paid to seller		—		—		(1,000)		(1,750)		—		—		—		(2,750)
Total remeasurement (gain) loss recognized in earnings		—		74		200		1,050		—		(295)		—		1,029
Balance as of September 30, 2018	$	—	$	665	$	—	$	1,750	$	—	$	1,081	$	5,618	$	9,114

We carry certain financial instruments, including accounts receivable, short-term borrowings, accounts payable and accrued liabilities at cost, which we believe approximates fair value because of the short-term maturity of these instruments.

The fair value of long-term debt is calculated by discounting the value of the note based on market interest rates for similar debt instruments, which is a Level 2 technique. The following table presents the estimated fair value and carrying value of our long-term debt (in millions):


	September 30,		September 30,
	2018		2017
Fair value	$	193.7	$	202.1
Carrying value	$	200.0	$	200.0

We did not have any significant non-financial assets or liabilities measured at fair value on a non-recurring basis in 2018, 2017, or 2016 other than assets and liabilities acquired in business acquisitions.