Debt and Other Financing - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		1 Months Ended		12 Months Ended
	Apr. 20, 2017	Apr. 30, 2017	Mar. 31, 2016	Dec. 31, 2017	Mar. 31, 2018
Line Of Credit Facility [Line Items]
Proceeds from issuance of warrants	$ 2,200
Warrants				$ 2,840	$ 2,840
Treasury stock acquired (in shares)		419
Cost per share (in dollars per share)		$ 3.60
Value of treasury stock acquired		$ 1,500
Remaining authorized repurchase amount					$ 15,300
Original Warrant
Line Of Credit Facility [Line Items]
Proceeds from issuance of warrants		$ 1,500
Number of securities called by warrants (in shares)		1,500
Exercise price of warrants (in dollars per share)		$ 5.00
Replacement Warrant
Line Of Credit Facility [Line Items]
Proceeds from issuance of warrants		$ 700
Number of securities called by warrants (in shares)					1,500
Exercise price of warrants (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
Loss on extinguishment of debt				1,500
Payment for debt extinguishment or debt prepayment cost				487
Credit Agreement | Crystal Financial S P V L L C
Line Of Credit Facility [Line Items]
Maximum borrowing capacity			$ 20,000
Credit Agreement | Crystal Financial S P V L L C | Minimum
Line Of Credit Facility [Line Items]
Credit agreement, minimum borrowed interest rate			10.50%
Credit Agreement | Crystal Financial S P V L L C | 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
Prepayment of principal amount, percent		25.00%
Long-term debt				21,500	$ 21,500
Percentage of minimum cash required on total outstanding amount		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 S P V L L C
Line Of Credit Facility [Line Items]
Long-term line of credit				21,500	21,500
Unamortized debt issuance costs					$ 710
Valuation allowances and reserves, balance				$ 764