Line of Credit	6 Months Ended
Jun. 30, 2017
Line of Credit [Abstract]
Line of Credit	9. Line of Credit On June 9, 2017, we entered into a Credit Agreement (the "Credit Agreement") with Wells Fargo Bank, National Association, as administrative agent and the other lenders parties thereto. The Credit Agreement replaces the Second Amended and Restated Credit Agreement dated as of July 13, 2013 between the Company, Silicon Valley Bank and the other lenders and signatories thereto (the "Prior Credit Agreement"). The new credit facility was used to repay amounts due under the Prior Credit Agreement and will be used for working capital and general corporate purposes. In connection with the new agreement, the Company wrote off $0.2 million in unamortized credit facility fees associated with the Prior Credit Agreement, which was included in "Net interest expense" on the Unaudited Condensed Consolidated Statements of Operations during the three and six months ended June 30, 2017. The Credit Agreement provides for revolving credit borrowings up to a maximum principal amount of $125.0 million, subject to a commitment increase of $75.0 million. All outstanding amounts owed under the Credit Agreement become due and payable no later than the final maturity date of June 9, 2022. The Credit Agreement also allows for the issuance of letters of credit in the aggregate amount of up to $10.0 million at any one time; outstanding letters of credit reduce the credit available for revolving credit borrowings. As of June 30, 2017, the Company had no outstanding letters of credit. Substantially all of the Company's assets are pledged to secure the credit facility. Borrowings under the Credit Agreement bear interest at the Company's option of the prime rate (4.25% on June 30, 2017) plus a margin ranging from 0.00% to 0.50% or one-month LIBOR (1.22% on June 30, 2017) plus a margin ranging from 1.00% to 1.75%. The Company incurs an annual commitment fee of 0.15% to 0.20% on the unused portion of the line of credit. The additional margin amount and annual commitment fee are dependent on the level of outstanding borrowings. As of June 30, 2017, the Company had $57.0 million of unused borrowing capacity. The Company is required to comply with various financial covenants under the Credit Agreement. Specifically, the Company is required to maintain a ratio of earnings before interest, taxes, depreciation, and amortization ("EBITDA") plus stock compensation to interest expense for the previous four consecutive fiscal quarters of not less than 3.00 to 1.00 and a ratio of indebtedness to EBITDA plus stock compensation ("Leverage Ratio") of not more than 3.00 to 1.00. Additionally, the Credit Agreement currently restricts the payment of dividends that would result in a pro forma Leverage Ratio of more than 2.00 to 1.00. At June 30, 2017, the Company was in compliance with all covenants under the Credit Agreement.

9. Line of Credit

On June 9, 2017, we entered into a Credit Agreement (the "Credit Agreement") with Wells Fargo Bank, National Association, as administrative agent and the other lenders parties thereto. The Credit Agreement replaces the Second Amended and Restated Credit Agreement dated as of July 13, 2013 between the Company, Silicon Valley Bank and the other lenders and signatories thereto (the "Prior Credit Agreement"). The new credit facility was used to repay amounts due under the Prior Credit Agreement and will be used for working capital and general corporate purposes. In connection with the new agreement, the Company wrote off $0.2 million in unamortized credit facility fees associated with the Prior Credit Agreement, which was included in "Net interest expense" on the Unaudited Condensed Consolidated Statements of Operations during the three and six months ended June 30, 2017. The Credit Agreement provides for revolving credit borrowings up to a maximum principal amount of $125.0 million, subject to a commitment increase of $75.0 million. All outstanding amounts owed under the Credit Agreement become due and payable no later than the final maturity date of June 9, 2022.

The Credit Agreement also allows for the issuance of letters of credit in the aggregate amount of up to $10.0 million at any one time; outstanding letters of credit reduce the credit available for revolving credit borrowings. As of June 30, 2017, the Company had no outstanding letters of credit. Substantially all of the Company's assets are pledged to secure the credit facility.

Borrowings under the Credit Agreement bear interest at the Company's option of the prime rate (4.25% on June 30, 2017) plus a margin ranging from 0.00% to 0.50% or one-month LIBOR (1.22% on June 30, 2017) plus a margin ranging from 1.00% to 1.75%. The Company incurs an annual commitment fee of 0.15% to 0.20% on the unused portion of the line of credit. The additional margin amount and annual commitment fee are dependent on the level of outstanding borrowings. As of June 30, 2017, the Company had $57.0 million of unused borrowing capacity.

The Company is required to comply with various financial covenants under the Credit Agreement. Specifically, the Company is required to maintain a ratio of earnings before interest, taxes, depreciation, and amortization ("EBITDA") plus stock compensation to interest expense for the previous four consecutive fiscal quarters of not less than 3.00 to 1.00 and a ratio of indebtedness to EBITDA plus stock compensation ("Leverage Ratio") of not more than 3.00 to 1.00. Additionally, the Credit Agreement currently restricts the payment of dividends that would result in a pro forma Leverage Ratio of more than 2.00 to 1.00.

At June 30, 2017, the Company was in compliance with all covenants under the Credit Agreement.