Line of Credit	6 Months Ended	12 Months Ended
Line of Credit	Jun. 30, 2013	Dec. 31, 2012
Line of Credit	(7) Line of Credit During the six months ended June 30, 2013, the Company borrowed $313.0 million and repaid $304.0 million under its line of credit. During the six months ended June 30, 2012, the Company borrowed $311.0 million and repaid $299.5 million under its line of credit. In May 2013, the Company increased the outstanding letter of credit from $10.0 million to $15.0 million. At June 30, 2013, the Company had $16.0 million available under its $80.0 million line of credit, reflecting $49.0 million outstanding under the line of credit and $15.0 million reserved under the standby letter of credit. The interest rate at June 30, 2013 and December 31, 2012 was 4.5%.	(6) Line of Credit On October 8, 2009, the Company entered into a loan and security agreement (the Loan Agreement) with Silicon Valley Bank (SVB), which is also a stockholder of the Company. The Loan Agreement permitted the Company to borrow through October 7, 2010 up to $3.0 million. On October 29, 2010, the Company amended the Loan Agreement to permit the Company to borrow through October 6, 2011 up to $10.0 million. On August 2, 2011, October 27, 2011 and April 30 2012, the Company further amended this Loan Agreement to permit the Company to borrow through April 30, 2014 up to $20.0 million, $40.0 million and $60.0 million, respectively. On September 19, 2012, the Company amended the Loan Agreement to add Chinatrust Bank U.S.A. as a second lender and to permit the Company to borrow through September 2014 up to $80.0 million. The Loan Agreement bears interest at the greater of prime plus 1.25% or 4.50%. The interest rate at December 31, 2011 and 2012 was 4.50%. In 2012, the Company paid a commitment fee of $296,000. The Loan Agreement contains a $1.0 million early termination fee. As part of the September 2012 amendment, the Company is required to pay monthly interest on the greater of the actual borrowings or $25.0 million. Since the Company’s intent is not to repay below the $25.0 million in the next twelve months, the Company has classified the $25.0 million of its line of credit as a non-current liability. SVB also issued a standby letter of credit which satisfied the additional collateral requirement to maintain a license to operate in India. The standby letter of credit amount reduces the $80.0 million the Company is permitted to borrow under the Loan Agreement at December 31, 2012. In July 2012, the Company increased the outstanding standby letter of credit from $5.5 million to $10.0 million. At December 31, 2012, the Company had $30.0 million available under this facility, reflecting $40.0 million outstanding under the line of credit and $10.0 million reserved under the standby letter of credit.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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