Income Taxes - Schedule of NOL Carryforwards (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Federal and state research and development tax credit carryforwards	$ 39,800	$ 30,500
Domestic country
Operating Loss Carryforwards [Line Items]
NOL carryforwards	21,500	26,100
State and local jurisdiction
Operating Loss Carryforwards [Line Items]
NOL carryforwards	28,200	45,000
Foreign country
Operating Loss Carryforwards [Line Items]
NOL carryforwards	$ 0	$ 300