Income Taxes - Additional Information (Details) - USD ($)	1 Months Ended	12 Months Ended
	Jan. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Tax Credit Carryforward [Line Items]
Amount transferred in state tax benefits to unrelated profitable businesses	$ 3,100,000
Proceeds received from amount transferred in state tax benefits to unrelated profitable businesses	$ 2,900,000
Accrued income taxes		$ 1,721,000	$ 0
Prepaid Expense, Noncurrent		2,800,000
Deferred tax liability related to investments		0
Provision for U.S. federal or state income taxes		139,000	$ 0	$ 0
Domestic tax authority
Tax Credit Carryforward [Line Items]
Net operating loss carry-forwards		61,100,000
Non-qualified stock options
Tax Credit Carryforward [Line Items]
Net operating loss carry-forwards		4,000,000
Net Operating Loss Related to Sale of Intangible Assets
Tax Credit Carryforward [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		29,500,000
Income Tax Expense
Tax Credit Carryforward [Line Items]
Amortization of prepaid expense		$ 139,000