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Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
U.S. federal corporate tax rate	21.00%	35.00%
Federal AMT tax		$ 0.2
Decrease in valuation allowance during the year	$ (56.9)	$ (20.6)
Percentage of limitation on federal and state net operating loss carryforwards	98.00%
Percentage of limitation on federal tax credit carryforwards	100.00%
Federal
Income Taxes [Line Items]
Net operating loss carryforwards, amount	$ 196.4
Net operating loss carryforwards available before expiration	2.5
Federal | Research and development
Income Taxes [Line Items]
Tax credit carryforwards with expiration	9.0
State
Income Taxes [Line Items]
Net operating loss carryforwards, amount	119.9
Net operating loss carryforwards available before expiration	2.2
State | Research and development
Income Taxes [Line Items]
Tax credit carryforwards without expiration	$ 8.2
Earliest Tax Year
Income Taxes [Line Items]
Net operating loss carryforwards, expiration year	2025
Latest Tax Year
Income Taxes [Line Items]
Net operating loss carryforwards, expiration year	2037

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Income taxes.

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