INVESTMENTS (Tables)

12 Months Ended

Sep. 30, 2017

Gain (Loss) on Investments [Line Items]

Summary of Investments by Type of Security

The following tables summarize investments by security type as of September 30, 2017 and 2016(amounts shown in thousands):

	September 30, 2017
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Available-for-sale securities:
US Treasury	$	3,897	$	—	$	(3	)	$	3,894
Corporate debt securities, short-term	26,393		—		(8		)	26,385
Corporate debt securities, long-term	3,785		—		(5		)	3,780
Total	$	34,075	$	—	$	(16	)	$	34,059

	September 30, 2016
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Available-for-sale securities:
U.S. Treasury, short-term	$	12,907	$	8	$	—		$	12,915
Corporate debt securities, short-term	11,949		2		(3		)	11,948
Corporate debt securities, long-term	1,954		1		(3		)	1,952
Total	$	26,810	$	11	$	(6	)	$	26,815

Summary of Fair Value of Investments Measured on Recurring Basis

The following tables represent the fair value hierarchy of the Company’s investments and acquisition-related contingent consideration as of September 30, 2017 and 2016(amounts shown in thousands):

	Balance		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
September 30, 2017:
Assets:
Short-term investments:
U.S. Treasury	$	3,894	$	3,894	$	—	$	—
Corporate debt securities
Financial	3,041		—		3,041		—
Industrial	9,503		—		9,503		—
Commercial paper
Financial	10,850		—		10,850		—
Industrial	2,991		—		2,991		—
Total short-term investments at fair value	30,279		3,894		26,385		—
Long-term investments:
U.S. Treasury	—		—		—		—
Corporate debt securities
Financial	1,858		—		1,858		—
Industrial	1,922		—		1,922		—
Total assets at fair value	$	34,059	$	3,894	$	30,165	$	—
Liabilities:
Acquisition-related contingent consideration	354		—		—		354
Total liabilities at fair value	$	354	$	—	$	—	$	354

	Balance		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
September 30, 2016:
Assets:
Short-term investments:
U.S. Treasury	$	12,915	$	12,915	$	—	$	—
Corporate debt securities
Financial	3,963		—		3,963		—
Industrial	4,445		—		4,445		—
Commercial paper
Financial	2,843		—		2,843		—
Industrial	697		—		697		—
Total short-term investments at fair value	24,863		12,915		11,948		—
Long-term investments:
Corporate debt securities
Financial	502		—		502		—
Industrial	1,450		—		1,450		—
Total assets at fair value	$	26,815	$	12,915	$	13,900	$	—
Liabilities:
Acquisition-related contingent consideration	252		—		—		252
Total liabilities at fair value	$	252	$	—	$	—	$	252

Contingent Consideration

Gain (Loss) on Investments [Line Items]

Summary of Acquisition-related Contingent Consideration Measured at Fair Value

The following table includes a summary of the Acquisition-related contingent consideration measured at fair value using significant unobservable inputs (Level 3) during the year ended September 30, 2017(amounts shown in thousands):

Balance at September 30, 2016	$	252
Expenses recorded due to changes in fair value	412
Issuance of common stock	(310		)
Balance at September 30, 2017	$	354