Organization (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |
6 Months Ended | ||||||
|---|---|---|---|---|---|---|---|
May 24, 2019 |
Jan. 30, 2019 |
Jun. 30, 2019 |
Jun. 30, 2018 |
May 22, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
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| Subsidiary, Sale of Stock [Line Items] | |||||||
| Accumulated deficit | $ 180,763 | $ 171,146 | |||||
| Cash used in operations | 9,708 | $ 12,804 | |||||
| Exercise price (in dollars per share) | $ 2 | ||||||
| Proceeds from issuance of common stock and warrants, net | 16,325 | 0 | |||||
| Cash | 13,262 | $ 13,890 | $ 7,655 | $ 27,813 | |||
| Debt covenant, unrestricted cash | 4,546 | ||||||
| Unrestricted cash | $ 8,716 | ||||||
| Common Stock | |||||||
| Subsidiary, Sale of Stock [Line Items] | |||||||
| Number of shares sold (in shares) | 3,067 | ||||||
| Price per share sold (in dollars per share) | $ 1.63 | ||||||
| Underwriting agreement | Common Stock | |||||||
| Subsidiary, Sale of Stock [Line Items] | |||||||
| Warrants issued (in shares) | 6,667 | ||||||
| Number of shares sold (in shares) | 6,667 | ||||||
| Price per share sold (in dollars per share) | $ 1.5 | ||||||
| Proceeds from issuance of common stock and warrants, net | $ 9,037 | ||||||
| X | ||||||||||
- Definition Debt Covenant, Covenant Compliance, Unrestricted Cash No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Exercise price per share or per unit of warrants or rights outstanding. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- 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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| X | ||||||||||
- Definition The cash inflow from the additional capital contribution to the entity. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. No definition available.
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| X | ||||||||||
- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. No definition available.
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Details
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- Details
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