Share-Based Compensation - Stock Option Activity under Stock Option Plans (Details) - USD ($)	9 Months Ended		21 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016
Number of Shares
Beginning balance (in shares)	442,012
Granted (in shares)	0	0	0
Exercised (in shares)	(22,385)
Cancelled (in shares)	(52,953)
Ending balance (in shares)	366,674		366,674
Vested and Expected to Vest (in shares)	366,674		366,674
Exercisable (in shares)	366,674		366,674
Weighted-Average Exercise Price
Beginning balance (in dollars per share)	$ 19.99
Granted (in dollars per share)
Exercised (in dollars per share)	13.80
Cancelled (in dollars per share)	25.09
Ending balance (in dollars per share)	19.63		$ 19.63
Vested and Expected to Vest (in dollars per share)	19.63		19.63
Exercisable (in dollars per share)	$ 19.63		$ 19.63
Weighted Average Remaining Contractual Term (in Years)
Outstanding (term)	2 years 9 months 15 days
Vested and Expected to Vest (term)	2 years 9 months 15 days
Exercisable (term)	2 years 9 months 15 days
Aggregate Intrinsic Value
Outstanding	$ 2,691,404		$ 2,691,404
Vested and Expected to Vest	2,691,404		2,691,404
Exercisable	$ 2,691,404		$ 2,691,404