Credit Facility (Detail) $ in Thousands	1 Months Ended
	Jun. 30, 2013 USD ($)	May. 31, 2012 item	Dec. 31, 2015 USD ($)	May. 21, 2012 USD ($)
Equipment facility
Principal
2016			$ 2,174
2017			478
Long-term Debt, Total			2,652
Interest
2016			62
2017			4
Total			66
Total
2016			2,236
2017			482
Total			$ 2,718
Original Line of Credit
Credit facility
Maximum borrowing capacity				$ 4,000
Minimum interest rate (as a percent)		4.00%
Percentage points above prime rate considered for determining interest rate		0.75%
Interest payment period		9 months
Number of equal monthly principal and interest payments | item		36
Percentage of increase in interest rate basis of existence of an event as per loan and security agreement		5.00%
New line of credit
Credit facility
Maximum borrowing capacity	$ 4,500
Minimum interest rate (as a percent)	4.00%
Percentage points above prime rate considered for determining interest rate	0.75%