Stock-Based Compensation (Schedule of Stock Option Activity) (Details) (USD $)	6 Months Ended
	Jun. 30, 2013
Shares
Outstanding, beginning balance	590,047
Granted	72,496
Forfeited	(18,263)
Outstanding, ending balance	644,280
Weighted Average Exercise Price
Outstanding, beginning balance	$ 0.71
Granted	$ 8.81
Forfeited	$ 0.59
Outstanding, ending balance	$ 1.63
Weighted average grant-date fair value of stock options granted	$ 7.26
Fair value of stock options vested	$ 158,000
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	8 years 29 days
Options Exercisable, shares	457,823
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	7 years 7 months 13 days
Options Exercisable, Weighted Average Exercise Price	$ 0.76
Options Vested and expected to vest, shares	457,823
Options Vested and expected to vest, Weighted Average Remaining Contractual Life (Years)	7 years 7 months 13 days
Options Vested and expected, Weighted Average Exercise Price	$ 0.76