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Nature of Operations and Summary of Significant Accounting Policies - Revenues and Long-Term Assets Information Concerning Principal Geographic Areas (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2014 | Sep. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Net revenues | $ 4,910,000 | $ 10,547,000 | $ 14,541,000 | $ 10,019,000 | $ 7,568,000 | $ 18,690,000 | $ 17,737,000 | $ 4,948,000 | $ 40,017,000 | $ 48,943,000
Long-Term Assets | 7,209,000 |  |  |  | 8,157,000 |  |  |  | 7,209,000 | 8,157,000
United States [Member] |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 40,017,000 | 48,943,000
Long-Term Assets | 7,209,000 |  |  |  | 7,913,000 |  |  |  | 7,209,000 | 7,913,000
United Kingdom [Member] |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 0 | 0
Long-Term Assets | $ 0 |  |  |  | $ 244,000 |  |  |  | $ 0 | $ 244,000

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