Notes Payable and Credit Arrangements
 9 Months Ended
Sep. 30, 2014
Notes Payable and Credit Arrangements [Abstract]  
Debt Disclosure
Notes Payable and Credit Arrangements

Prior to their expiration on April 30, 2014, the Company had two separate credit facilities with Silicon Valley Bank (the “Bank” or “SVB”): (i) a Second Amended and Restated Loan and Security Agreement (as amended, the "Revolving Credit Facility") and (ii) an Amended and Restated Export-Import Bank Loan and Security Agreement (as amended, the "Ex-Im Facility") pursuant to which outstanding amounts under this facility were guaranteed by the Export-Import Bank of the United States (the “EXIM Bank”). The credit facilities provided an aggregate amount of $1.5 million under both facilities, with up to $1.0 million under the Revolving Credit Facility and up to $1.5 million under the Ex-Im Facility. Under the credit facilities, interest on outstanding borrowings accrued at a rate per annum equal to the greater of (i) the prime rate plus 2.5% or (ii) 7.0%. The entire amount owed under the credit facilities was repaid by April 30, 2014.

N2 Bio has two separate agreements under one credit facility with Middlesex Savings Bank (“MSB”): (i) a Secured Term Loan and (ii) a Secured Revolving Demand Note. Under the Secured Term Loan, N2 Bio borrowed $6.0 million on September 18, 2013 to finance the purchase of the Bio Business Unit from the Company. The advance made under the Secured Term Loan will bear interest at a fixed rate of 4.5% per annum in eighty-four (84) consecutive monthly payments starting on October 18, 2013. If not sooner paid, the Secured Term Loan shall be due and payable in full on September 18, 2020. The Secured Revolving Demand Note provides an amount available of up to $1.0 million. Advances made under the Secured Revolving Demand Note will bear interest at MSB's prime rate, as determined, plus 0.5% per annum but in no event shall the interest rate be less than 3.75% per annum. The maturity date of the Secured Revolving Demand Note is May 31, 2015.

N2 Bio's obligations under the credit facility are secured by substantially all of the assets of N2 Bio. Advances under the Secured Revolving Demand Note are limited to 75% of eligible receivables. In addition, until all amounts under the credit facility with MSB are repaid, covenants under the credit facility impose restrictions on the N2 Bio's ability to, among other things, incur additional indebtedness, create or permit liens on the N2 Bio's assets, merge, consolidate or dispose of assets (other than in the ordinary course of business), make dividend and other restricted payments, make certain debt or equity investments, make certain acquisitions, engage in certain transactions with affiliates or change the business conducted by the N2 Bio. Any failure by N2 Bio to comply with the covenants and obligations under the credit facility could result in an event of default, in which case MSB may be entitled to declare all amounts owed to be due and payable immediately.

Advances outstanding under the Revolving Credit Facility were zero and $107 thousand at September 30, 2014 and December 31, 2013, respectively.  Advances outstanding under the Ex-Im Facility were zero and $38 thousand at September 30, 2014 and December 31, 2013, respectively.  Advances outstanding under the N2 Bio Secured Term Loan were $5.3 million and $5.8 million at September 30, 2014 and December 31, 2013, respectively. Advances outstanding under the N2 Bio Secured Revolving Demand Note were zero and $438 thousand at September 30, 2014 and December 31, 2013, respectively. The interest rate per annum on the N2 Bio Secured Term Loan and Secured Revolving Demand Note on September 30, 2014 was 4.5% and 3.75%, respectively. Availability under the Secured Revolving Demand Note was $669 thousand as of September 30, 2014.

The Company has outstanding letters of credit to secure performance obligations and purchase commitments. Holders of the letters of credit are allowed to draw funds up to the face amount of the letter of credit if the Company does not perform as contractually required.  The outstanding letters of credit are secured by restricted cash. Outstanding letters of credit totaled $188 thousand and $170 thousand at September 30, 2014 and December 31, 2013, respectively.