Fair Value Measurements - Schedule of Fair Value Measurements by Level for Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Cash equivalents	$ 6,519	$ 19,731
Short-term investments	10,024
Level 1 [Member] \| Recurring [Member]
Cash equivalents	6,519	19,731
Short-term investments	10,024
Level 2 [Member] \| Recurring [Member]
Cash equivalents
Short-term investments
Level 3 [Member] \| Recurring [Member]
Cash equivalents
Short-term investments

Fair value portion 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.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant