Income Taxes - Net Deferred Tax Asset (Liability) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Net operating loss and capital loss carryforward - 382 limited	$ 18,824	$ 43,916
Net operating loss carryforward - not 382 limited	15,725	31,576
Company basis difference	12,808	22,984
Reserves and accruals	2,426	189
Equity-based compensation expense	542	11,908
AMT and other credits	349	0
Other, net	398	1,568
Total deferred tax assets	51,072	112,141
Valuation allowance	(51,072)	(112,141)
Total deferred tax assets, net of valuation allowance	$ 0	$ 0