Debt - Additional Information (Detail) (USD $)				12 Months Ended		12 Months Ended	1 Months Ended	12 Months Ended			1 Months Ended		6 Months Ended	9 Months Ended			1 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2012 Securities Pledged as Collateral	Dec. 31, 2012 Comerica - Growth Capital Facility	Jun. 30, 2012 Comerica - Growth Capital Facility	Dec. 31, 2012 Compliance With Covenants	Mar. 31, 2010 Oxford Growth Capital Facility	Dec. 31, 2012 Oxford Growth Capital Facility	Dec. 31, 2011 Oxford Growth Capital Facility	Dec. 31, 2010 Oxford Growth Capital Facility	Mar. 31, 2011 Oxford Growth Capital Facility Extended Maturity	Sep. 30, 2011 Revolving Credit Facility Comerica - Growth Capital Facility	Jun. 30, 2012 Revolving Credit Facility Comerica - Growth Capital Facility	Sep. 30, 2012 Revolving Credit Facility Comerica - Growth Capital Facility	Dec. 31, 2012 Revolving Credit Facility Comerica - Growth Capital Facility	Dec. 31, 2011 Revolving Credit Facility Comerica - Growth Capital Facility	Sep. 30, 2011 Capital Loan Comerica - Growth Capital Facility	Jun. 30, 2012 Capital Loan Comerica - Growth Capital Facility
Line of Credit Facility [Line Items]
Amended Credit Agreement					$ 12,000,000								$ 7,000,000					$ 5,000,000
Growth capital loan from amended Credit Agreement																	5,000,000
Percentage of investments made in subsidiary			35.00%
Principal and interest payment							Interest-only payments due for the first nine months and then equal principal and interest payments for an additional 30 months.										Growth Capital Loan, which matures on September 30, 2015, bears a fixed interest rate of 6.37%, with interest-only payments due for the first twelve months, followed by equal principal and interest payments for the remaining 36 months.
Maturity period											Sep. 30, 2011			Jun. 30, 2014			Sep. 30, 2015
Fixed interest rate							12.04%										6.37%
Interest Only payments Period				12 months				9 months
Principal and interest payments				36 months				30 months
Commitment fee												20,000	20,000				40,000
Loan fees																	50,000
Effective interest rate								13.84%									7.07%
Final payment fee percentage																	1.00%
Amount under RLOC available to the Company															80.00%
Outstanding amounts															3,200,000	2,300,000
Lender's prime rate plus 1.50%														Lender's prime rate plus 1.50%
Margin rate															1.50%
Floating rate of interest															4.75%	4.75%
Frequency of commitment fee														Annually on June 30
Commitment fee at each annual anniversary beginning June 30, 2013														20,000
Minimum cash balance						2,500,000
Minimum revenues levels percentage						75.00%
Issuance of senior secured notes							5,000,000
Senior secured notes, upfront facility fee										100,000
Senior secured notes, closing cost	49,000	84,000						100,000
Senior secured notes, facility fee								400,000
Senior secured notes, non utilization fee										100,000
Senior secured notes, not drawn amount										5,000,000
Closing cost and fees									$ 0.2