Notes Payable - Additional Information (Detail) - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Total outstanding amounts of notes	$ 18,226,000		$ 18,774,000	[1]
Principal payments	548,000	$ 1,293,000
Cash interest paid on Notes	1,214,000	1,372,000
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
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	$ 18,200,000		18,800,000
Principal payments	600,000		$ 2,900,000
Cash interest paid on Notes	$ 1,200,000	$ 1,400,000

[1] Balances derived from audited financial statements as of December 31, 2016.