Line of Credit	3 Months Ended
Mar. 31, 2015
Debt Disclosure [Abstract]
Line of Credit	11. Line of Credit We have maintained a line of credit arrangement with our principal bank since 2003. On June 25, 2013, we closed on a new senior secured credit facility, as amended on April 30, 2015 (the “Senior Credit Facility” or “Credit Agreement”), with the Silicon Valley Bank and a syndicate of lenders. The Credit Agreement includes a revolving loan facility (“Revolving Loan Facility”) for up to $30,000 and matures on March 31, 2018. The principal amount outstanding under the Revolving Loan Facility is payable prior to or on the maturity date. Interest on the Revolving Loan Facility accrues at Eurodollar/LIBOR (beginning at L+3.75%) or Alternate Base Rate (“ABR”) (beginning at ABR +2.75%), which may be adjusted as provided in the Credit Agreement, and is payable monthly. The Revolving Loan Facility includes two sub-facilities: (i) a $10,000 letter of credit sub-facility pursuant to which the bank may issue letters of credit, and (ii) a $5,000 swingline sub-facility. As of March 31, 2015 and December 31, 2014, we had $6,000 and $5,000, respectively, of borrowings under our Revolving Loan Facility, and we had $24,000 and $25,000, respectively, of unused borrowing availability.

Line of Credit

3 Months Ended

Mar. 31, 2015

11. Line of Credit

We have maintained a line of credit arrangement with our principal bank since 2003. On June 25, 2013, we closed on a new senior secured credit facility, as amended on April 30, 2015 (the “Senior Credit Facility” or “Credit Agreement”), with the Silicon Valley Bank and a syndicate of lenders. The Credit Agreement includes a revolving loan facility (“Revolving Loan Facility”) for up to $30,000 and matures on March 31, 2018. The principal amount outstanding under the Revolving Loan Facility is payable prior to or on the maturity date. Interest on the Revolving Loan Facility accrues at Eurodollar/LIBOR (beginning at L+3.75%) or Alternate Base Rate (“ABR”) (beginning at ABR +2.75%), which may be adjusted as provided in the Credit Agreement, and is payable monthly.

The Revolving Loan Facility includes two sub-facilities: (i) a $10,000 letter of credit sub-facility pursuant to which the bank may issue letters of credit, and (ii) a $5,000 swingline sub-facility.

As of March 31, 2015 and December 31, 2014, we had $6,000 and $5,000, respectively, of borrowings under our Revolving Loan Facility, and we had $24,000 and $25,000, respectively, of unused borrowing availability.