Fair Value Measurement of Financial Instruments (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Fair value disclosures
Convertible notes - short term		$ 13,694	$ 13,565
Convertible notes - long-term	$ 14,866	13,866	13,549
Nonrecurring \| Carrying Value
Fair value disclosures
Loan payable	14,866	27,560	27,114
Nonrecurring \| Fair Value
Fair value disclosures
Loan payable	11,700	25,394	24,815
Nonrecurring \| Level 3 \| Carrying Value
Fair value disclosures
Convertible notes - short term		13,694	13,565
Convertible notes - long-term	14,866	13,866	13,549
Nonrecurring \| Level 3 \| Fair Value
Fair value disclosures
Convertible notes - short term		13,694	13,565
Convertible notes - long-term	$ 11,700	$ 11,700	$ 11,250
Fair value assumptions
Time to maturity (in years)	2 years 10 months 13 days
Volatility rate (as a percent)	60.00%
Risk-free interest rate (as a percent)	2.88%

Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

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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.

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No definition available.

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Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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Risk-free interest rate assumption used in valuing an instrument.

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Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-SubTopic 210
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-Subparagraph (SX 210.9-03(16))
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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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