Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Deferred tax assets, valuation allowance	$ 92,878	$ 88,476
Deferred tax asset, change in valuation allowance amount	4,400
Deferred tax assets, Cumulative tax attributes	18,200
Uncertain income tax positions	0	0
Expected uncertain tax position during next twelve months	0
Federal
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 143,400	110,700
Federal | Earliest Tax Year
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards Expiration Year	2021
Federal | Latest Tax Year
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards Expiration Year	2035
State
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 73,000	$ 44,500
State | Earliest Tax Year
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards Expiration Year	2016
State | Latest Tax Year
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards Expiration Year	2035