Marketable Securities and Fair Value Measurements - Summary of Financial Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Available For Sale Securities [Line Items]
Total Fair Value	$ 66,914	$ 52,907
Level I
Schedule Of Available For Sale Securities [Line Items]
Total Fair Value	66,914	52,906
Level II
Schedule Of Available For Sale Securities [Line Items]
Total Fair Value	0	1
Level III
Schedule Of Available For Sale Securities [Line Items]
Total Fair Value	0	0
Certificates of deposit
Schedule Of Available For Sale Securities [Line Items]
Total Fair Value	2,319	2,318
Certificates of deposit | Level I
Schedule Of Available For Sale Securities [Line Items]
Total Fair Value	2,319	2,318
Certificates of deposit | Level II
Schedule Of Available For Sale Securities [Line Items]
Total Fair Value	0	0
Certificates of deposit | Level III
Schedule Of Available For Sale Securities [Line Items]
Total Fair Value	0	0
U.S. treasuries
Schedule Of Available For Sale Securities [Line Items]
Total Fair Value	64,091	50,082
U.S. treasuries | Level I
Schedule Of Available For Sale Securities [Line Items]
Total Fair Value	64,091	50,082
U.S. treasuries | Level II
Schedule Of Available For Sale Securities [Line Items]
Total Fair Value	0	0
U.S. treasuries | Level III
Schedule Of Available For Sale Securities [Line Items]
Total Fair Value	0	0
Mutual funds
Schedule Of Available For Sale Securities [Line Items]
Total Fair Value	504	506
Mutual funds | Level I
Schedule Of Available For Sale Securities [Line Items]
Total Fair Value	504	506
Mutual funds | Level II
Schedule Of Available For Sale Securities [Line Items]
Total Fair Value	0	0
Mutual funds | Level III
Schedule Of Available For Sale Securities [Line Items]
Total Fair Value	$ 0	0
Interest rate cap
Schedule Of Available For Sale Securities [Line Items]
Total Fair Value		1
Interest rate cap | Level I
Schedule Of Available For Sale Securities [Line Items]
Total Fair Value		0
Interest rate cap | Level II
Schedule Of Available For Sale Securities [Line Items]
Total Fair Value		1
Interest rate cap | Level III
Schedule Of Available For Sale Securities [Line Items]
Total Fair Value		$ 0