Capital Stock	12 Months Ended
Dec. 31, 2016
Capital Stock [Abstract]
Capital Stock	11. Capital Stock The Company's Board of Directors has authorized 32,000,000 total shares of capital stock, of which 30,000,000 are designated as common stock and 2,000,000 are designated as preferred stock. The Board of Directors has the authority to establish one or more classes of preferred stock and to determine, within any class of preferred stock, the preferences, rights and other terms of such class. As of December 31, 2016, the Company has reserved 4,892,641 shares of common stock for issuance, 1,556,833 are reserved for shares upon exercise of outstanding stock options, and 1,688,480 are reserved for shares upon vesting of restricted stock units. The Company has 1,647,328 shares available for future grants under the Company's 1995 Long-Term Incentive Plan. Preferred Stock Rights On March 21, 2011, the Board of Directors of the Company declared a dividend, payable to holders of record as of the close of business on April 1, 2011, of one preferred stock purchase right (a Right) for each outstanding share of common stock, par value $0.01 per share, of the Company (the Common Stock) and in addition, entered into a Stockholder Protection Rights Agreement (as amended from time to time, the Rights Agreement) with Continental Stock Transfer & Trust Company, as Rights Agent. The Rights traded with and were inseparable from the Common Stock and were not evidenced by separate certificates. Each Right entitled its holder to purchase from the Company one-hundredth of a share of participating preferred stock having economic and voting terms similar to the Common Stock at an exercise price of $8.00 per Right, subject to adjustment in accordance with the terms of the Rights Agreement, if the Rights had become exercisable. Under the Rights Agreement, the Rights would have become exercisable if any person or group acquired 20% or more of the Common Stock or, in the case of any person or group that owned 20% or more of the Common Stock. Upon exercise of the Right in accordance with the Rights Agreement, the holder was able to purchase a number of shares of Common Stock from the Company having an aggregate market price (as defined in the Rights Agreement) equal to twice the then-current exercise price for an amount in cash equal to the then-current exercise price. In addition, the Company, in certain circumstances and pursuant to the terms of the Rights Agreement, would have exchanged the Rights for one share of Common Stock or an equivalent security for each Right or, alternatively, redeemed the Rights for $0.001 per Right. On March 21, 2014, the Rights Agreement was amended to extend the term an additional two years. At the close of business on March 21, 2016, the Rights and the Rights Agreement expired and no person retained any rights pursuant to the Rights Agreement or any Right.

Capital Stock

12 Months Ended

Dec. 31, 2016

11. Capital Stock

The Company's Board of Directors has authorized 32,000,000 total shares of capital stock, of which 30,000,000 are designated as common stock and 2,000,000 are designated as preferred stock. The Board of Directors has the authority to establish one or more classes of preferred stock and to determine, within any class of preferred stock, the preferences, rights and other terms of such class.

As of December 31, 2016, the Company has reserved 4,892,641 shares of common stock for issuance, 1,556,833 are reserved for shares upon exercise of outstanding stock options, and 1,688,480 are reserved for shares upon vesting of restricted stock units. The Company has 1,647,328 shares available for future grants under the Company's 1995 Long-Term Incentive Plan.

Preferred Stock Rights

On March 21, 2011, the Board of Directors of the Company declared a dividend, payable to holders of record as of the close of business on April 1, 2011, of one preferred stock purchase right (a Right) for each outstanding share of common stock, par value $0.01 per share, of the Company (the Common Stock) and in addition, entered into a Stockholder Protection Rights Agreement (as amended from time to time, the Rights Agreement) with Continental Stock Transfer & Trust Company, as Rights Agent. The Rights traded with and were inseparable from the Common Stock and were not evidenced by separate certificates. Each Right entitled its holder to purchase from the Company one-hundredth of a share of participating preferred stock having economic and voting terms similar to the Common Stock at an exercise price of $8.00 per Right, subject to adjustment in accordance with the terms of the Rights Agreement, if the Rights had become exercisable. Under the Rights Agreement, the Rights would have become exercisable if any person or group acquired 20% or more of the Common Stock or, in the case of any person or group that owned 20% or more of the Common Stock. Upon exercise of the Right in accordance with the Rights Agreement, the holder was able to purchase a number of shares of Common Stock from the Company having an aggregate market price (as defined in the Rights Agreement) equal to twice the then-current exercise price for an amount in cash equal to the then-current exercise price. In addition, the Company, in certain circumstances and pursuant to the terms of the Rights Agreement, would have exchanged the Rights for one share of Common Stock or an equivalent security for each Right or, alternatively, redeemed the Rights for $0.001 per Right.

On March 21, 2014, the Rights Agreement was amended to extend the term an additional two years. At the close of business on March 21, 2016, the Rights and the Rights Agreement expired and no person retained any rights pursuant to the Rights Agreement or any Right.