Income Taxes Income Taxes - Schedule of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Net operating loss carryforwards	$ 87,181	$ 40,502
Stock—based compensation	1,911	2,097
Development costs	619	27,213
Deferred interest	11,494	0
Deferred compensation	590	68
Depreciation	5,604	376
Other	907	952
Deferred tax assets	108,306	71,208
Deferred tax liability:
Depreciation	(2,037)	0
Net deferred tax assets	106,269	71,208
Valuation allowance	(106,378)	(71,208)
Deferred tax liability, net	$ (109)	$ 0