Investments - Summary of Amortized Cost, Unrealized Gains and Losses and Fair Value of Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 32,657	$ 49,072
Unrealized Gain	32	44
Unrealized Loss	(5)	(16)
Total Fair Value	32,684	49,100
Corporate bonds and notes – short-term | Short-term investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	32,657	49,072
Unrealized Gain	32	44
Unrealized Loss	(5)	(16)
Total Fair Value	$ 32,684	$ 49,100