Nature of Operations and Significant Accounting Policies (Details Narrative) - USD ($) |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2018 |
Mar. 31, 2018 |
Sep. 30, 2019 |
Sep. 30, 2018 |
Dec. 31, 2018 |
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| Cash, cash equivalents and short-term investments | $ 47,900,000 | ||||
| Net assets | 142,772,000 | $ 174,399,000 | |||
| Net cash used in operating activities | $ (48,574,000) | $ (22,144,000) | |||
| Accounting Standards Update 2014-09 [Member] | |||||
| New accounting pronouncement, effect of change on operating results | $ 543,000 | $ 2,067,000 | |||
| New accounting pronouncement, effect of adoption, quantification | $ 543,000 | $ 2,067,000 | |||
| New accounting pronouncement, effect of change on diluted earnings per share | $ 0.01 | $ 0.04 | |||
| Options [Member] | |||||
| Antidilutive securities excluded from computation of earnings per share, amount | 6,697,980 | 5,999,544 | |||
| Warrants [Member] | |||||
| Antidilutive securities excluded from computation of earnings per share, amount | 1,820,686 | 2,220,687 | |||
| X | ||||||||||
- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of the effect of a change in accounting principle on diluted earnings per share. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of the effect of a change in accounting principle on net income. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of the effect of a change in accounting principle on operating profit or loss. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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