Income Taxes - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2013
Massachusetts
Income Taxes [Line Items]
Net operating loss carryforwards	$ 87,000
Tax credit carryforwards expiration dates	2015
Investment tax credit	4,000
Research and development tax credit	22,000
Remaining unutilized operating loss carryforwards	66,000
Massachusetts | Beginning before January 1, 2010
Income Taxes [Line Items]
Net operating loss carryforwards	3,700,000
Massachusetts | Beginning on or after January 1, 2010
Income Taxes [Line Items]
Net operating loss carryforwards	8,400,000
Federal
Income Taxes [Line Items]
Net operating loss carryforwards, federal	16,700,000
State
Income Taxes [Line Items]
Net operating loss carryforwards, state	12,300,000
New York State
Income Taxes [Line Items]
Net operating loss carryforwards	$ 202,000
Maximum | Massachusetts | Beginning before January 1, 2010
Income Taxes [Line Items]
Operating loss carryforwards expiration year	2015
Maximum | Massachusetts | Beginning on or after January 1, 2010
Income Taxes [Line Items]
Operating loss carryforwards expiration year	2032
Maximum | New York State
Income Taxes [Line Items]
Operating loss carryforwards expiration year	2032
Federal General Business | Maximum
Income Taxes [Line Items]
Tax credit carryforwards expiration dates	2032