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v3.20.1

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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