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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 |
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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 |  |  |  |  |  |  |  |  |

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