Common Stock	12 Months Ended
Dec. 31, 2017
Stockholders' Equity Note [Abstract]
Common Stock	Common Stock The holders of common stock are entitled to one vote per share. As of December 31, 2017, there were 16,747,926 shares of common stock issued and outstanding. In addition, as of December 31, 2017, there were 340,302 shares reserved for issuance under outstanding equity compensation awards such as stock options and restricted stock units and an additional 605,788 shares available for issuance for future grants of awards under the 2011 Plan. Stock Repurchase Program We have a share repurchase program under which we may repurchase shares of our common stock from time to time in the open market, subject to prevailing business and market conditions and other factors. During the years ended December 31, 2017, 2016 and 2015, we repurchased approximately 182,000, 340,000 and 477,000 shares, respectively, of our common stock in the open market for a total cost of approximately $4.3 million, $8.0 million and $12.3 million, respectively. As of December 31, 2017, there was approximately $11.7 million available for future repurchases under the buyback program. There is no expiration date for the repurchase program. Securities Purchase Agreement On December 30, 2009, we entered into a Securities Purchase Agreement (the “Purchase Agreement”) with a single accredited investor, Sagard Capital Partners, L.P. (“Sagard”), pursuant to which we sold to Sagard, in a private placement, an aggregate of 2,857,143 shares (the “Shares”) of our common stock, par value $0.01, at a price of $7.00 per share (the “Offering”), for an aggregate purchase price of $20.0 million. The Offering closed on December 30, 2009. The Purchase Agreement prohibits Sagard from acquiring beneficial ownership of more than 23% of our common stock (calculated on a fully diluted basis). As of December 31, 2017, Sagard beneficially owned 3,639,367 shares or 21.7% of our outstanding common stock. In connection with the Offering, on December 30, 2009, we entered into a Registration Rights Agreement (the “Registration Rights Agreement”) with Sagard. Pursuant to the Registration Rights Agreement, we filed a registration statement with the Securities and Exchange Commission (the “SEC”) for purposes of registering the resale of the Shares and any shares of common stock issued pursuant to the preemptive rights under Section 4(l) of the Purchase Agreement (or any shares of common stock issuable upon exercise, conversion or exchange of securities issued pursuant to the preemptive rights). We filed the registration statement with the SEC on September 27, 2010 and it was declared effective by the SEC on October 8, 2010. If we fail to meet filing or effectiveness deadlines with respect to any additional registration statements required by the Registration Rights Agreement, or fail to keep any registration statements continuously effective (with limited exceptions), we will be obligated to pay to the holders of the Shares liquidated damages in the amount of 1% of the purchase price for the Shares per month, up to a maximum of $2.4 million. We also agreed, among other things, to indemnify the selling holders under the registration statements from certain liabilities and to pay all fees and expenses (excluding underwriting discounts and selling commissions and all legal fees of the selling holders in excess of $25,000) incident to our obligations under the Registration Rights Agreement.

Common Stock

The holders of common stock are entitled to one vote per share. As of December 31, 2017, there were 16,747,926 shares of common stock issued and outstanding. In addition, as of December 31, 2017, there were 340,302 shares reserved for issuance under outstanding equity compensation awards such as stock options and restricted stock units and an additional 605,788 shares available for issuance for future grants of awards under the 2011 Plan.

Stock Repurchase Program

We have a share repurchase program under which we may repurchase shares of our common stock from time to time in the open market, subject to prevailing business and market conditions and other factors. During the years ended December 31, 2017, 2016 and 2015, we repurchased approximately 182,000, 340,000 and 477,000 shares, respectively, of our common stock in the open market for a total cost of approximately $4.3 million, $8.0 million and $12.3 million, respectively. As of December 31, 2017, there was approximately $11.7 million available for future repurchases under the buyback program. There is no expiration date for the repurchase program.

Securities Purchase Agreement

On December 30, 2009, we entered into a Securities Purchase Agreement (the “Purchase Agreement”) with a single accredited investor, Sagard Capital Partners, L.P. (“Sagard”), pursuant to which we sold to Sagard, in a private placement, an aggregate of 2,857,143 shares (the “Shares”) of our common stock, par value $0.01, at a price of $7.00 per share (the “Offering”), for an aggregate purchase price of $20.0 million. The Offering closed on December 30, 2009. The Purchase Agreement prohibits Sagard from acquiring beneficial ownership of more than 23% of our common stock (calculated on a fully diluted basis). As of December 31, 2017, Sagard beneficially owned 3,639,367 shares or 21.7% of our outstanding common stock.

In connection with the Offering, on December 30, 2009, we entered into a Registration Rights Agreement (the “Registration Rights Agreement”) with Sagard. Pursuant to the Registration Rights Agreement, we filed a registration statement with the Securities and Exchange Commission (the “SEC”) for purposes of registering the resale of the Shares and any shares of common stock issued pursuant to the preemptive rights under Section 4(l) of the Purchase Agreement (or any shares of common stock issuable upon exercise, conversion or exchange of securities issued pursuant to the preemptive rights). We filed the registration statement with the SEC on September 27, 2010 and it was declared effective by the SEC on October 8, 2010. If we fail to meet filing or effectiveness deadlines with respect to any additional registration statements required by the Registration Rights Agreement, or fail to keep any registration statements continuously effective (with limited exceptions), we will be obligated to pay to the holders of the Shares liquidated damages in the amount of 1% of the purchase price for the Shares per month, up to a maximum of $2.4 million. We also agreed, among other things, to indemnify the selling holders under the registration statements from certain liabilities and to pay all fees and expenses (excluding underwriting discounts and selling commissions and all legal fees of the selling holders in excess of $25,000) incident to our obligations under the Registration Rights Agreement.