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INVESTMENTS - SUMMARY OF INVESTMENTS BY TYPE OF SECURITY (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 34,075 | $ 26,810
Gross Unrealized Gains | 0 | 11
Gross Unrealized Losses | (16) | (6)
Fair Market Value | 34,059 | 26,815
US Treasury | Short-term investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 3,897 | 12,907
Gross Unrealized Gains | 0 | 8
Gross Unrealized Losses | (3) | 0
Fair Market Value | 3,894 | 12,915
Corporate debt securities | Short-term investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 26,393 | 11,949
Gross Unrealized Gains | 0 | 2
Gross Unrealized Losses | (8) | (3)
Fair Market Value | 26,385 | 11,948
Corporate debt securities | Long-term investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 3,785 | 1,954
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (5) | (3)
Fair Market Value | $ 3,780 | $ 1,952

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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