Earnings (Loss) Per Share - Narrative (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of common stock warrant and common stock options exercised (in shares)	0	660,921	1,646,372	2,899,458
Number of common stock issued for stock warrant and stock options exercised (in shares)		658,357	1,373,515	2,771,514
Shares surrendered in lieu of cash payment (in shares)		2,564	272,857	127,944
Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from calculation (in shares)	1,016,090		1,636,706