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.