Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Loss Carryforwards [Line Items]
Valuation allowances related to U.S. based deferred taxes		$ 15,600,000	$ 27,500,000
Valuation allowance	79,458,000	79,458,000	63,881,000
Research and development tax credits	87,000	87,000
Statutory federal income tax rate		34.00%	34.00%	34.00%
Internal revenue code related to annual use of operating loss carry forwards		Annual use of the Company's net operating loss and research and development credit carryforwards may be limited in the event a cumulative change in ownership of more than 50% occurs within a three-year period.
Internal revenue code, cumulative change in ownership		50.00%
Uncertain income tax position unrecognized		Less than a 50% likelihood
Settlements and lapses in statutes of limitations		71,000	50,000
Associated interest due to expiration of the applicable statutes of limitations for certain tax years		236,000	5,000
Total liability for unrecognized tax benefits included other long-term liabilities		62,000	367,000
Recognized tax benefits that would affect the effective tax rate	62,000	62,000
Interest and penalties related to unrecognized tax benefits in the provision for income taxes		0	200,000
Expected unrecognized tax benefits due to expiration of limitations applicable to the 2009 taxable year	62,000
Uncertain tax liability	552,000
Interest accrual	236,000	236,000
Domestic Country [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance	74,700,000	74,700,000	58,900,000
Net operating loss carryforwards	116,300,000	116,300,000
Net operating loss expiration dates		2026 through 2033
Research and development tax credit carryforwards	4,700,000	4,700,000
Tax credits expiration dates		2027 through 2032
Foreign Country [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance	4,700,000	4,700,000	5,000,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	39,300,000	39,300,000
Net operating loss expiration dates		2014 through 2033
Research and development tax credit carryforwards	$ 5,000,000	$ 5,000,000