Debt - Additional Information (Detail) (USD $)			1 Months Ended	9 Months Ended	1 Months Ended				9 Months Ended	1 Months Ended				1 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Feb. 18, 2010 Revolving Credit Facility	Sep. 30, 2012 Revolving Credit Facility	Feb. 18, 2010 Revolving Credit Facility Minimum	Feb. 18, 2010 Revolving Credit Facility First Amendment	May 18, 2011 Revolving Credit Facility Second Amendment	May 17, 2012 Revolving Credit Facility Third Amendment	Sep. 30, 2012 Revolving Credit Facility Second and Third Amendment	May 18, 2011 Term Loan Installment	Sep. 30, 2012 Term Loan	May 18, 2011 Term Loan On or before May 18, 2013	May 18, 2011 Term Loan After May 18, 2013	May 23, 2011 Hansen Note	Jan. 31, 2010 Hansen Note	Sep. 30, 2012 Hansen Note
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity			$ 5,000,000				$ 1,000,000
Credit facility, floating annual interest rate					6.00%
Debt, additional interest above prime rate			2.00%						1.00%	2.00%
Credit facility, interest rate description			At a floating annual interest rate equal to the greater of (a) 6% or (b) SVB's prime rate then in effect plus 2%.						The annual interest rate on the Line of Credit is equal to the greater of (a) 6% or (b) SVB's prime rate plus 1%, payable monthly in arrears, and we are obligated to pay to SVB an unused Line of Credit fee equal to one-quarter of one percent (0.25%), of the unused borrowing capacity payable monthly.
Credit facility, maturity date			Feb. 17, 2011			May 18, 2011	May 18, 2012	May 17, 2014
Debt, face amount										6,000,000					5,000,000
Debt, number of monthly payment										48
Debt, frequency of periodic payment										Monthly
Debt, fee amount if prepayment made												60,000	0
Debt, stated percentage									6.00%
Termination fee									10,000
Unused Line of Credit fee percentage									0.25%
Frequency of commitment fee payment									Monthly
Credit facility, covenant compliance				As of September 30, 2012, we were in compliance with all covenants.
Long-term debt obligation											4,100,000
Long-term debt obligation, excluding current maturities	2,500,000	3,625,000									2,500,000
Current portion of long term debt obligation	1,625,000	1,625,000									1,600,000
Line of Credit, outstanding amount	0
Line of credit	1,000,000
Debt, interest rate															8.50%
Payment in full for all principal and accrued interest														3,000,000
Debt, unamortized discount														$ 190,000		$ 62,000