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Notes Payable - Additional Information (Detail) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |
Total outstanding amounts of notes | $ 19,558,000 |  | $ 21,743,000 | [1]
Principal payments | 2,185,000 | $ 3,330,000 |  |
Cash interest paid on Notes | 2,008,000 | 1,951,000 |  |
Collateral Account used for future payments | 400,000 |  |  |
Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Collateral Account used for future payments |  |  | 1,000 |
PIK Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Issued aggregate principal amount | 19,400,000 |  | 19,400,000 |
13% Senior First Lien Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Issued aggregate principal amount | $ 110,000,000 |  |  |
Notes maturity date | Mar. 19, 2030 |  |  |
Principal payments | $ 2,100,000 |  | 10,400,000 |
13% Senior Second Lien Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Issued aggregate principal amount | $ 20,000,000 |  |  |
Notes maturity date | Mar. 19, 2030 |  |  |
Total outstanding amounts of notes | $ 19,600,000 |  | $ 21,700,000 |
Principal payments from restricted cash | 9,000,000 |  |  |
13% Senior First And Second Lien Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Cash interest paid on Notes | $ 2,000,000 | $ 1,900,000 |  |
[1] | Balances derived from audited financial statements as of December 31, 2015.

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