Earnings (Loss) Per Share - Narrative (Details) - shares	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of common stock warrant and common stock options exercised	439,238	2,106,679	2,238,537	24,168,461
Number of common stock issued for stock warrant and stock options exercised	318,082	2,106,634	2,113,157	22,635,661
Shares surrendered in lieu of cash payment	121,156	45	125,380	1,206,654
Common stock investments, available for sale
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares		11,261,582		14,375,502