Capital Stock and Stock Compensation Plans - Additional Information (Details)	12 Months Ended
	Dec. 31, 2015
Stock Options [Abstract]
Right to repurchase shares at fair market value (in hundredths)	100.00%
Expiration after grant date, prior (in years)	8 years
Expiration after grant date, after (in years)	10 years
Employee
Stock Options [Abstract]
Vesting period (in years)	3 years
Non Employee Director
Stock Options [Abstract]
Vesting period (in years)	1 year