Fair Value Measurement - Summary of Fair Values of Assets and Liabilities Measured at Fair Value On Recurring and NonRecurring Basis (Details) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|---|---|---|---|---|
| Cash and cash equivalents | $ 3,640 | $ 9,276 | $ 3,970 | $ 1,034 |
| Warrants potentially settleable in cash | 1,476 | 4,115 | ||
| Quoted Prices in Active Markets Level 1 [Member] | ||||
| Cash and cash equivalents | 3,640 | 9,276 | ||
| Warrants potentially settleable in cash | ||||
| Significant Other Observable Inputs Level 2 [Member] | ||||
| Cash and cash equivalents | ||||
| Warrants potentially settleable in cash | ||||
| Unobservable Inputs Level 3 [Member] | ||||
| Cash and cash equivalents | ||||
| Warrants potentially settleable in cash | $ 1,476 | $ 4,115 |
| 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://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Fair value portion of warrants not settleable in cash classified as equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|