Net Loss per Share - Reconciliation Of Shares Used In Calculating Basic and Diluted Earnings Per Share (Details) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Basic (in shares)	56,063,777	56,452,408	54,478,754
Effect of assumed exercised options (in shares)	0	0	0
Diluted (in shares)	56,063,777	56,452,408	54,478,754