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Income Taxes - Schedule of Effective Income Tax Amount Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
U.S. federal tax at statutory rate									$ (2,958)	$ (4,014)	$ (8,764)
U.S. state income taxes									(708)	490	(756)
Non-deductible expense (benefit)									(5,673)	931	438
Research and development credit									(402)	(262)	(440)
Stock-based compensation									(14,622)	983	737
Impact of 2017 Tax Act									25,952	0	0
Other									2	(104)	481
Change in valuation allowance									(1,323)	2,030	8,365
Total provision for income taxes	$ 126	$ 43	$ 50	$ 49	$ (14)	$ (2)	$ 42	$ 28	$ 268	$ 54	$ 61

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Effective Income Tax Rate Reconciliation, Tax Cuts And Jobs Act of 2017, Amount

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

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Amount 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 increase (decrease) in the valuation allowance for deferred tax assets.

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