Investments (Tables)

9 Months Ended

Jun. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Summary of Investments by Type of Security

The following tables summarize investments by type of security as of June 30, 2018 and September 30, 2017, respectively (amounts shown in thousands):

June 30, 2018:	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Available-for-sale securities:
U.S. Treasury, short-term	$	3,688	$	—	$	(15	)	$	3,673
Corporate debt securities, short-term	5,731		—		(27		)	5,704
Total	$	9,419	$	—	$	(42	)	$	9,377

September 30, 2017:	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Available-for-sale securities:
U.S. Treasury, short-term	$	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

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 June 30, 2018 and September 30, 2017, respectively (amounts shown in thousands):

June 30, 2018:	Balance		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Short-term investments:
U.S. Treasury	$	3,673	$	3,673	$	—	$	—
Corporate debt securities
Financial	2,843		—		2,843		—
Industrial	2,861		—		2,861		—
Total assets at fair value	$	9,377	$	3,673	$	5,704	$	—
Liabilities:
Acquisition-related contingent consideration	2,361		—		—		2,361
Total liabilities at fair value	$	2,361	$	—	$	—	$	2,361

September 30, 2017:	Balance		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
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:
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

Summary of Contingent Consideration Measured at Fair Value

The following table includes a summary of the contingent consideration measured at fair value using significant unobservable inputs (Level 3) during the nine months ended June 30, 2018(amounts shown in thousands):

Balance at September 30, 2017	$	354
Contingent consideration associated with the ICAR Acquisition	2,867
Expenses recorded due to changes in fair value	1,397
Payment of contingent consideration	(1,489		)
Issuance of common stock	(710		)
Foreign currency effect on contingent consideration	(58		)
Balance at June 30, 2018	$	2,361