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Summary of Significant Accounting Policies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) Institution	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid lease payments for promotional and marketing facility		$ 4,000
Concentration of Credit Risk and Others Risks and Uncertainties [Abstract]
Number of financial institutions holding company's cash | Institution	2
Stock-Based Compensation [Abstract]
Option vesting term	4 years
New Accounting Pronouncements [Abstract]
Balance	$ (5,628)	(9,888)	$ (1,553)
Minimum [Member]
Property and Equipment [Abstract]
Useful lives	5 years
Intangible Assets [Abstract]
Estimated useful lives	3 years
Maximum [Member]
Property and Equipment [Abstract]
Useful lives	7 years
Intangible Assets [Abstract]
Estimated useful lives	15 years
Accumulated Deficit [Member]
New Accounting Pronouncements [Abstract]
Balance	$ 217,602	$ 198,422	175,516
Highly Liquid Debt Investments [Member] | Maximum [Member]
Investments [Abstract]
Contractual maturities of investment securities	2 years
ASU 2014-09 [Member]
New Accounting Pronouncements [Abstract]
Balance			(2,500)
ASU 2014-09 [Member] | Deferred Revenue [Member]
New Accounting Pronouncements [Abstract]
Balance			(2,500)
ASU 2014-09 [Member] | Accumulated Deficit [Member]
New Accounting Pronouncements [Abstract]
Balance			$ (2,500)

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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