Income Taxes - Reconciliation of U.S. Statutory Rate and Effective Tax Rate (Details)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
U.S. federal tax rate	21.00%	35.00%	35.00%
Impact of federal tax legislation	0.00%	25.82%	0.00%
State income taxes, net of federal benefit	4.56%	7.71%	5.34%
Non-taxable foreign loss	0.09%	(0.51%)	(2.69%)
Stock-based compensation	1.97%	(0.02%)	(1.46%)
Other	(1.13%)	(2.19%)	(0.18%)
Change in valuation allowance	(26.49%)	(64.61%)	(36.20%)
Effective tax rate	0.00%	1.20%	(0.19%)

Effective Income Tax Rate Reconciliation, Impact of Federal Tax Legislation, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to excess tax benefit for share-based compensation cost.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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