Debt and Other Financing - Additional Information (Detail) - USD ($)		1 Months Ended	12 Months Ended
	Apr. 20, 2017	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2017	Dec. 31, 2015
Line of Credit Facility [Line Items]
Repayments of debt			$ 13,920,000	$ 6,568,000
Loss on extinguishment of debt			1,525,000	0
Proceeds from issuance of warrants	$ 2,200,000		2,200,000	0
Number of securities called by warrants or rights (in shares)	1,500,000
Warrants outstanding			$ 2,840,000	$ 0
Purchase of treasury stock (in shares)	419,000		419,000	0
Average cost per share (in dollars per share)	$ 3.60		$ 3.60
Treasury stock acquired	$ 1,500,000
Share repurchase program remaining repurchase amount			$ 15,300,000		$ 15,300,000
Original Warrant
Line of Credit Facility [Line Items]
Proceeds from issuance of warrants	$ 1,500,000
Number of securities called by warrants or rights (in shares)	1,500,000
Exercise price of warrants or rights (in dollars per share)	$ 5.00
Replacement Warrant
Line of Credit Facility [Line Items]
Proceeds from issuance of warrants	$ 700,000		$ 2,200,000
Number of securities called by warrants or rights (in shares)	1,500,000		1,500,000
Exercise price of warrants or rights (in dollars per share)	$ 2.50		$ 2.50
Term of warrant	5 years
Credit Agreement
Line of Credit Facility [Line Items]
Repayments of debt	$ 13,900,000
Loss on extinguishment of debt			$ 1,500,000
Debt prepayment cost			487,000
Credit Agreement | Crystal Financial SPV LLC
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity		$ 20,000,000
Outstanding borrowings				$ 13,400,000
Unamortized debt issuance costs				1,200,000
Credit Agreement | Crystal Financial SPV LLC | Minimum
Line of Credit Facility [Line Items]
Credit agreement, minimum borrowed interest rate		10.50%
Credit Agreement | Crystal Financial SPV LLC | LIBOR
Line of Credit Facility [Line Items]
Credit agreement, basis spread on variable interest rate		10.00%
New Credit Agreement
Line of Credit Facility [Line Items]
Credit agreement, minimum borrowed interest rate	9.99%
Debt Instrument, periodic payment, principal	$ 1,300,000
Prepayment of principal amount outstanding as a percent of excess cash flow	25.00%
Percentage of minimum cash to be maintained on outstanding term loan	20.00%
New Credit Agreement | LIBOR
Line of Credit Facility [Line Items]
Credit agreement, basis spread on variable interest rate	8.25%
New Credit Agreement | Crystal Financial SPV LLC
Line of Credit Facility [Line Items]
Outstanding borrowings			21,500,000
Short-term debt classified, net			0
Allowance for Unamortized Debt Discount and Debt Issuance Costs
Line of Credit Facility [Line Items]
Valuation allowances and reserves, balance			$ 764,000	$ 1,194,000		$ 0