Annual report pursuant to Section 13 and 15(d)

Income Taxes - Components of Net Deferred Tax Assets (Details)

v3.6.0.2
Income Taxes - Components of Net Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Components Of Deferred Tax Assets [Abstract]    
Capitalized research and development expenses $ 53,557 $ 50,808
Net operating loss carryforwards 123,672 115,869
Research and development and other credit carryforwards 25,297 24,268
Other 15,400 18,748
Total deferred tax assets 217,926 209,693
Valuation allowance $ (217,926) $ (209,693)