Capital Stock	12 Months Ended
Dec. 31, 2017
Capital Stock [Abstract]
Capital Stock	13. 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, 2017, the Company has reserved 4,301,854 shares of common stock for issuance; 1,046,833 are reserved for shares upon exercise of outstanding stock options and 1,634,663 are reserved for shares upon vesting of restricted stock units. The Company has 1,620,358 shares available for future grants under the Company's 1995 Long-Term Incentive Plan.

Capital Stock

12 Months Ended

Dec. 31, 2017

13. 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, 2017, the Company has reserved 4,301,854 shares of common stock for issuance; 1,046,833 are reserved for shares upon exercise of outstanding stock options and 1,634,663 are reserved for shares upon vesting of restricted stock units. The Company has 1,620,358 shares available for future grants under the Company's 1995 Long-Term Incentive Plan.