Fair Value Measurements - Additional Information (Details)	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]
Fair value of preferred stock warrant liability, probability of IPO scenario, percentage	20.00%
Fair value of preferred stock warrant liability, probability of merger scenario, percentage	10.00%
Fair value of preferred stock warrant liability, probability of stay private scenario, percentage	70.00%